diff --git a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/adapter/NoteAdapter.java b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/adapter/NoteAdapter.java
index 7488fcc0..8614c1ea 100644
--- a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/adapter/NoteAdapter.java
+++ b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/adapter/NoteAdapter.java
@@ -71,18 +71,18 @@ public void onBindViewHolder(@NonNull NoteHolder holder, int position) {
 
         switch (currentNote.getType()) {
             case DbContract.NoteEntry.TYPE_TEXT:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_short_text_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_short_text_icon_24dp);
                 holder.textViewDescription.setText(Html.fromHtml(currentNote.getContent()));
                 holder.textViewDescription.setMaxLines(3);
                 break;
             case DbContract.NoteEntry.TYPE_AUDIO:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_mic_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_mic_icon_24dp);
                 break;
             case DbContract.NoteEntry.TYPE_SKETCH:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_photo_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_photo_icon_24dp);
                 break;
             case DbContract.NoteEntry.TYPE_CHECKLIST:
-                holder.imageViewcategory.setImageResource(R.drawable.ic_format_list_bulleted_black_24dp);
+                holder.imageViewcategory.setImageResource(R.drawable.ic_format_list_bulleted_icon_24dp);
                 String preview = "";
                 try {
                     JSONArray content = new JSONArray(currentNote.getContent());
diff --git a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.java b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.kt
similarity index 56%
rename from app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.java
rename to app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.kt
index 3e1c1b02..c5c167b4 100644
--- a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.java
+++ b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/fragments/SettingsFragment.kt
@@ -11,20 +11,25 @@
  You should have received a copy of the GNU General Public License
  along with Privacy Friendly Notes. If not, see <http://www.gnu.org/licenses/>.
  */
-package org.secuso.privacyfriendlynotes.ui.fragments;
+package org.secuso.privacyfriendlynotes.ui.fragments
 
-import android.os.Bundle;
-import android.preference.PreferenceFragment;
-
-import org.secuso.privacyfriendlynotes.R;
+import android.os.Bundle
+import android.preference.PreferenceFragment
+import androidx.appcompat.app.AppCompatDelegate
+import org.secuso.privacyfriendlynotes.R
 
 /**
  * Fragment that provides the settings.
  * Created by Robin on 11.09.2016.
  */
-public class SettingsFragment extends PreferenceFragment {
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        addPreferencesFromResource(R.xml.pref_settings);
+class SettingsFragment : PreferenceFragment() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        addPreferencesFromResource(R.xml.pref_settings)
+        findPreference("settings_day_night_theme")?.setOnPreferenceChangeListener { _, newValue ->
+            AppCompatDelegate.setDefaultNightMode(newValue.toString().toInt())
+            true;
+        }
+
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/main/MainActivity.java b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/main/MainActivity.java
index b735ddd9..899306dc 100644
--- a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/main/MainActivity.java
+++ b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/main/MainActivity.java
@@ -15,6 +15,7 @@
 
 import android.app.Activity;
 import android.content.Intent;
+import android.graphics.drawable.ColorDrawable;
 import android.os.Bundle;
 import android.preference.PreferenceManager;
 import com.google.android.material.navigation.NavigationView;
@@ -24,8 +25,10 @@
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 
+import android.util.Log;
 import android.widget.SearchView;
 
+import androidx.appcompat.app.AppCompatDelegate;
 import androidx.arch.core.util.Function;
 import androidx.core.view.GravityCompat;
 import androidx.appcompat.app.ActionBarDrawerToggle;
@@ -107,7 +110,7 @@ protected void onCreate(Bundle savedInstanceState) {
         setContentView(R.layout.activity_main);
         Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
         setSupportActionBar(toolbar);
-
+        getSupportActionBar().setStackedBackgroundDrawable(new ColorDrawable(getResources().getColor(R.color.colorPrimary)));
         //set the OnClickListeners
         findViewById(R.id.fab_text).setOnClickListener(this);
         findViewById(R.id.fab_checklist).setOnClickListener(this);
@@ -208,6 +211,10 @@ public boolean onQueryTextSubmit(String query) {
         });
 
         PreferenceManager.setDefaultValues(this, R.xml.pref_settings, false);
+
+        String theme = PreferenceManager.getDefaultSharedPreferences(this).getString("settings_day_night_theme", "-1");
+        Log.d("Theme", theme);
+        AppCompatDelegate.setDefaultNightMode(Integer.parseInt(theme));
     }
 
     @Override
diff --git a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/notes/AudioNoteActivity.kt b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/notes/AudioNoteActivity.kt
index b0b73e0a..ef2d8d5d 100644
--- a/app/src/main/java/org/secuso/privacyfriendlynotes/ui/notes/AudioNoteActivity.kt
+++ b/app/src/main/java/org/secuso/privacyfriendlynotes/ui/notes/AudioNoteActivity.kt
@@ -254,9 +254,9 @@ class AudioNoteActivity : BaseNoteActivity(DbContract.NoteEntry.TYPE_AUDIO) {
 
     private fun togglePlayPauseButton() {
         if (playing) {
-            btnPlayPause.setBackgroundResource(R.drawable.ic_pause_black_24dp)
+            btnPlayPause.setBackgroundResource(R.drawable.ic_pause_icon_24dp)
         } else {
-            btnPlayPause.setBackgroundResource(R.drawable.ic_play_arrow_black_24dp)
+            btnPlayPause.setBackgroundResource(R.drawable.ic_play_arrow_icon_24dp)
         }
     }
 
diff --git a/app/src/main/res/drawable/ic_format_list_bulleted_black_24dp.xml b/app/src/main/res/drawable/ic_format_list_bulleted_icon_24dp.xml
similarity index 92%
rename from app/src/main/res/drawable/ic_format_list_bulleted_black_24dp.xml
rename to app/src/main/res/drawable/ic_format_list_bulleted_icon_24dp.xml
index 5937a4eb..a2a187ec 100644
--- a/app/src/main/res/drawable/ic_format_list_bulleted_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_format_list_bulleted_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M4,10.5c-0.83,0 -1.5,0.67 -1.5,1.5s0.67,1.5 1.5,1.5 1.5,-0.67 1.5,-1.5 -0.67,-1.5 -1.5,-1.5zM4,4.5c-0.83,0 -1.5,0.67 -1.5,1.5S3.17,7.5 4,7.5 5.5,6.83 5.5,6 4.83,4.5 4,4.5zM4,16.67c-0.74,0 -1.33,0.6 -1.33,1.33s0.6,1.33 1.33,1.33 1.33,-0.6 1.33,-1.33 -0.59,-1.33 -1.33,-1.33zM7,19h14v-2L7,17v2zM7,13h14v-2L7,11v2zM7,5v2h14L21,5L7,5z"/>
 </vector>
diff --git a/app/src/main/res/drawable/ic_mic_black_24dp.xml b/app/src/main/res/drawable/ic_mic_icon_24dp.xml
similarity index 90%
rename from app/src/main/res/drawable/ic_mic_black_24dp.xml
rename to app/src/main/res/drawable/ic_mic_icon_24dp.xml
index 4f0dc044..e6a2385b 100644
--- a/app/src/main/res/drawable/ic_mic_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_mic_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M12,14c1.66,0 2.99,-1.34 2.99,-3L15,5c0,-1.66 -1.34,-3 -3,-3S9,3.34 9,5v6c0,1.66 1.34,3 3,3zM17.3,11c0,3 -2.54,5.1 -5.3,5.1S6.7,14 6.7,11L5,11c0,3.41 2.72,6.23 6,6.72L11,21h2v-3.28c3.28,-0.48 6,-3.3 6,-6.72h-1.7z"/>
 </vector>
diff --git a/app/src/main/res/drawable/ic_pause_black_24dp.xml b/app/src/main/res/drawable/ic_pause_icon_24dp.xml
similarity index 85%
rename from app/src/main/res/drawable/ic_pause_black_24dp.xml
rename to app/src/main/res/drawable/ic_pause_icon_24dp.xml
index bb28a6c4..2a09bfd9 100644
--- a/app/src/main/res/drawable/ic_pause_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_pause_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M6,19h4L10,5L6,5v14zM14,5v14h4L18,5h-4z"/>
 </vector>
diff --git a/app/src/main/res/drawable/ic_photo_black_24dp.xml b/app/src/main/res/drawable/ic_photo_icon_24dp.xml
similarity index 88%
rename from app/src/main/res/drawable/ic_photo_black_24dp.xml
rename to app/src/main/res/drawable/ic_photo_icon_24dp.xml
index b2018595..c3363c70 100644
--- a/app/src/main/res/drawable/ic_photo_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_photo_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M21,19V5c0,-1.1 -0.9,-2 -2,-2H5c-1.1,0 -2,0.9 -2,2v14c0,1.1 0.9,2 2,2h14c1.1,0 2,-0.9 2,-2zM8.5,13.5l2.5,3.01L14.5,12l4.5,6H5l3.5,-4.5z"/>
 </vector>
diff --git a/app/src/main/res/drawable/ic_play_arrow_black_24dp.xml b/app/src/main/res/drawable/ic_play_arrow_icon_24dp.xml
similarity index 84%
rename from app/src/main/res/drawable/ic_play_arrow_black_24dp.xml
rename to app/src/main/res/drawable/ic_play_arrow_icon_24dp.xml
index bf9b895a..a34b479e 100644
--- a/app/src/main/res/drawable/ic_play_arrow_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_play_arrow_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M8,5v14l11,-7z"/>
 </vector>
diff --git a/app/src/main/res/drawable/ic_short_text_black_24dp.xml b/app/src/main/res/drawable/ic_short_text_icon_24dp.xml
similarity index 85%
rename from app/src/main/res/drawable/ic_short_text_black_24dp.xml
rename to app/src/main/res/drawable/ic_short_text_icon_24dp.xml
index 11c24c5a..c0ee7a03 100644
--- a/app/src/main/res/drawable/ic_short_text_black_24dp.xml
+++ b/app/src/main/res/drawable/ic_short_text_icon_24dp.xml
@@ -4,6 +4,6 @@
         android:viewportWidth="24.0"
         android:viewportHeight="24.0">
     <path
-        android:fillColor="#FF000000"
+        android:fillColor="?attr/colorIconFill"
         android:pathData="M4,9h16v2L4,11zM4,13h10v2L4,15z"/>
 </vector>
diff --git a/app/src/main/res/drawable/secuso_logo_blau_blau.png b/app/src/main/res/drawable/secuso_logo_blau_blau.png
deleted file mode 100644
index 9c82d7c8..00000000
Binary files a/app/src/main/res/drawable/secuso_logo_blau_blau.png and /dev/null differ
diff --git a/app/src/main/res/drawable/secuso_logo_blau_blau.xml b/app/src/main/res/drawable/secuso_logo_blau_blau.xml
new file mode 100644
index 00000000..1d9eee3f
--- /dev/null
+++ b/app/src/main/res/drawable/secuso_logo_blau_blau.xml
@@ -0,0 +1,214 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="1000dp"
+    android:height="315dp"
+    android:viewportWidth="1000"
+    android:viewportHeight="315">
+    <path
+        android:pathData="M172.3,55c-2.4,1 -4.3,2.4 -4.3,2.9 0,1.4 2.1,1.8 15.8,3.1 6.3,0.6 15.7,2 20.9,3 11.3,2.4 13.3,2.5 13.3,0.6 0,-2.4 -5.8,-6.5 -11.3,-8.1 -5.8,-1.6 -20,-3.5 -26.2,-3.5 -2.2,-0 -5.9,0.9 -8.2,2z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M159.1,55.1c-6.6,1.3 -17.8,5.2 -16.3,5.7 2.6,0.8 15,-2 18.8,-4.3 4.2,-2.6 4.1,-2.7 -2.5,-1.4z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M226.6,66.7c2.3,2.1 7.9,5.5 12.5,7.6l8.4,3.7 -3.5,-3c-3.7,-3.1 -16.2,-10.5 -19.5,-11.5 -1.3,-0.4 -0.5,0.7 2.1,3.2z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M137,65.5c-8.7,1.7 -13.3,3.7 -19.9,8.7 -12.8,9.7 -25.1,24.9 -31.6,39.3 -3.4,7.4 -8.1,21.3 -7.4,21.9 0.2,0.2 9.3,0.6 20.3,0.9l19.8,0.6 2.8,-2.9c1.8,-2 3.1,-4.9 4,-9.2 3.3,-16.3 13.2,-40.6 21.7,-53.4 1.9,-2.9 3.2,-5.8 2.8,-6.3 -0.8,-1.4 -4.2,-1.3 -12.5,0.4zM128.8,75c0.3,2.1 -6.9,14 -8.5,14 -1.9,-0 -1.7,-0.6 1.7,-5.5 3.7,-5.4 4,-7.9 0.8,-7 -3.6,1 -7,3.8 -10.7,8.6 -1.8,2.4 -4,4.6 -4.8,4.7 -0.9,0.2 0.5,-2.3 3,-5.6 6.4,-8.3 17.6,-13.9 18.5,-9.2zM124,91c0,0.6 -0.8,2.7 -1.9,4.8 -1,2 -3.3,8 -5.1,13.2 -1.8,5.2 -3.8,10 -4.4,10.6 -1.4,1.5 -24.4,2.5 -25.3,1.1 -0.7,-1.1 9.6,-21.9 13,-26.1 1.9,-2.3 3.4,-3 8.2,-3.6 9.1,-1.1 15.5,-1.1 15.5,-0z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M107.7,97.8c-1,1 -1.7,2.5 -1.7,3.2 0,0.7 -0.6,2.1 -1.3,2.9 -0.8,0.9 -2.3,4 -3.5,6.8 -2.1,5.3 -2.1,5.3 -0.1,5.3 1.5,-0 2.7,-1.5 4.5,-5.5 1.3,-3.1 2.4,-6.4 2.4,-7.4 0,-1 0.7,-2.4 1.5,-3.1 1.6,-1.3 2,-4 0.7,-4 -0.5,-0 -1.6,0.8 -2.5,1.8z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M161.5,65.4c-7.1,3.1 -19.4,29.4 -26,55.2 -2,8.2 -1.9,13.7 0.3,16.4 1.6,1.9 4.4,2.5 28.7,5.5 14.9,1.9 34.1,4.6 42.9,5.9 24.2,3.9 24.2,3.8 23.3,-28.3 -0.6,-20.5 -1.8,-29.4 -5.5,-40.6 -2.7,-8 -6.2,-9.1 -40,-13.5 -17.8,-2.3 -19.7,-2.4 -23.7,-0.6zM185.4,76.1c5.2,2.4 5.6,12.6 0.7,18.8 -4.8,6.1 -4,10 3,13.6 4.3,2.3 5.2,4.7 4.4,12.6 -0.4,3.8 -1,6.9 -1.5,6.9 -1.7,-0 -38.3,-5 -38.6,-5.3 -0.2,-0.1 0.4,-3 1.2,-6.2 1.9,-7.3 4.5,-10.2 10,-11.6 7,-1.8 8.6,-4.6 6.5,-11.8 -1.1,-3.8 -1,-5.2 0.3,-9.5 0.9,-2.8 2.4,-5.8 3.3,-6.8 1.8,-2.1 7,-2.4 10.7,-0.7zM205.5,87.5c3.5,3.5 3.5,10.4 -0.1,15.1 -3.4,4.3 -2.7,6.9 2.9,10.9 4.1,3 4.2,3.3 4.5,9 0.3,8.7 0,8.9 -9.2,7.5l-7.7,-1.3 0.7,-4.2c1.1,-7.6 0.8,-11.2 -1.1,-14.1 -1.1,-1.6 -1.8,-3.7 -1.7,-4.6 0.2,-0.9 -0.2,-3.5 -0.8,-5.7 -1.2,-4.6 0,-10.9 2.6,-13.6 2.3,-2.3 7.1,-1.9 9.9,1z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M343,77.8c-5.5,2.7 -6.1,4.8 -5.8,21.6l0.3,14.8 3.7,3.2c2,1.7 14.9,9.8 28.7,18.1l25.1,15 0,10.7 0,10.8 -16,-0 -16,-0 0,-11 0,-11 -13.1,-0 -13,-0 0.3,14.9c0.3,16.7 0.9,18.2 7.7,20.1 4.7,1.3 63.5,1.3 68.2,-0 7,-2 7.4,-3.1 7.4,-22 0,-16.3 -0.1,-16.9 -2.4,-19.4 -1.3,-1.3 -14.2,-9.6 -28.7,-18.3l-26.4,-15.8 0,-9.8 0,-9.7 16,-0 16,-0 0,10 0,10 13,-0 13,-0 0,-12.8c0,-14.4 -0.8,-16.8 -6,-19.4 -3.1,-1.6 -7.1,-1.8 -36,-1.8 -28.9,-0 -32.9,0.2 -36,1.8z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M439,131l0,55 36,-0 36,-0 0,-7 0,-7 -22.7,-0.2 -22.8,-0.3 -0.3,-17.3 -0.2,-17.2 19.5,-0 19.5,-0 0,-7 0,-7 -19.2,-0.2 -19.3,-0.3 -0.3,-16.3 -0.2,-16.2 22.5,-0 22.5,-0 0,-7 0,-7 -35.5,-0 -35.5,-0 0,55z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M532.3,77.5c-1.7,0.7 -3.6,2.2 -4.2,3.4 -0.8,1.3 -1.1,17.6 -1.1,50.3 0,53.8 -0.3,51.8 6.8,53.8 5,1.3 65.5,1.3 70.5,-0.1 7.2,-2 7.7,-3.3 7.7,-20.6l0,-15.3 -13,-0 -13,-0 0,11.5 0,11.5 -16.5,-0 -16.5,-0 0,-41 0,-41 16.5,-0 16.4,-0 0.3,10.7 0.3,10.8 12.5,-0 12.5,-0 0.3,-13.5c0.1,-7.4 0,-14.5 -0.3,-15.8 -0.4,-1.5 -2.1,-3 -4.8,-4.2 -3.9,-1.8 -6.8,-2 -37.7,-1.9 -26.2,-0 -34.2,0.3 -36.7,1.4z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M630,126.4c0,29.7 0.4,51.5 1,53 0.5,1.4 2.1,3.3 3.7,4.3 2.5,1.6 5.7,1.8 38.3,1.8 38.2,-0 40.7,-0.3 42.9,-5.1 0.8,-1.8 1.1,-17.7 1.1,-53.4l0,-51 -13,-0 -13,-0 0,48 0,48 -17.5,-0 -17.5,-0 0,-48 0,-48 -13,-0 -13,-0 0,50.4z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M741,77.8c-1.9,0.9 -4,2.8 -4.7,4.2 -1.9,3.7 -1.8,29.2 0.1,32.8 1,1.9 8.6,7 24.6,16.7 12.8,7.6 25.2,15.2 27.6,16.7l4.4,2.8 0,10.5 0,10.5 -16,-0 -16,-0 0,-11 0,-11 -13.1,-0 -13,-0 0.3,14.9c0.3,16.7 0.9,18.2 7.7,20.1 4.7,1.3 63.5,1.3 68.2,-0 7,-2 7.4,-3.1 7.4,-22 0,-16.2 -0.1,-16.9 -2.3,-19.3 -1.2,-1.3 -14.2,-9.5 -28.7,-18.3l-26.5,-15.9 0,-9.7 0,-9.8 16,-0 16,-0 0,10 0,10 13,-0 13,-0 0,-12.8c0,-14.4 -0.8,-16.8 -6,-19.4 -3.1,-1.6 -7.1,-1.8 -36,-1.8 -28.9,-0 -32.9,0.2 -36,1.8z"
+        android:fillColor="?attr/colorPrimaryDark"
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+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M865,224l0,15 7,-0c8.1,-0 9.5,-1.8 1.8,-2.2l-5.3,-0.3 -0.3,-5.8 -0.3,-5.7 4.5,-0c6.1,-0 6.8,-1.8 0.9,-2.2l-4.8,-0.3 -0.3,-5.8 -0.3,-5.7 5,-0c2.7,-0 5.3,-0.5 5.6,-1 0.4,-0.6 -2,-1 -6.4,-1l-7.1,-0 0,15z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M884,210c0,0.5 1.6,1 3.5,1l3.5,-0 0,14c0,13.3 0.1,14 2,14 1.9,-0 2,-0.7 2,-14l0,-14 3,-0c1.7,-0 3,-0.5 3,-1 0,-0.6 -3.5,-1 -8.5,-1 -5,-0 -8.5,0.4 -8.5,1z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M906,209.9c0,0.5 1.6,4.6 3.5,9 2.7,6.2 3.5,9.2 3.5,14 0,5.3 0.2,6.1 1.9,6.1 1.7,-0 2,-0.9 2.3,-7.3 0.3,-5.2 1.3,-9.2 3.6,-14.6 1.8,-4 3.2,-7.5 3.2,-7.7 0,-0.2 -0.8,-0.4 -1.8,-0.4 -1.4,-0 -2.5,1.7 -4.3,7 -1.3,3.8 -2.6,7 -2.9,7 -0.3,-0 -1.6,-3 -3,-6.7 -1.6,-4.4 -3.1,-6.9 -4.3,-7.1 -0.9,-0.2 -1.7,0.1 -1.7,0.7z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M530,223.9c0,2.4 3.4,2.2 3.8,-0.2 0.2,-1.2 -0.3,-1.7 -1.7,-1.7 -1.4,-0 -2.1,0.6 -2.1,1.9z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M753,223.5c0,0.8 0.9,1.5 2,1.5 1.1,-0 2,-0.7 2,-1.5 0,-0.8 -0.9,-1.5 -2,-1.5 -1.1,-0 -2,0.7 -2,1.5z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M111.2,235.7c3.8,4.1 13.8,10.8 22.7,15.2 4.5,2.3 8.5,4.1 8.6,3.9 0.2,-0.2 -2.6,-3.5 -6.3,-7.4 -6.4,-6.7 -7.2,-7.2 -17,-10.5 -10,-3.5 -10.2,-3.5 -8,-1.2z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M142.4,245.1c-0.8,1.3 4.1,8.5 7.7,11.1 3,2.3 12.1,4.4 23.1,5.4 7.1,0.6 8,0.5 12,-1.9 5.7,-3.3 8.9,-6.9 7.9,-8.5 -0.5,-0.9 -6.5,-2 -17.2,-3.2 -9,-1.1 -18.8,-2.4 -21.8,-3 -6.9,-1.3 -10.8,-1.3 -11.7,0.1z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+    <path
+        android:pathData="M214,250c-7.9,0.7 -10.8,1.9 -18,7.7l-4.5,3.6 4.5,-0.8c8.9,-1.5 19.5,-4.7 26.4,-8l7.1,-3.3 -4,-0c-2.2,0.1 -7.4,0.4 -11.5,0.8z"
+        android:fillColor="?attr/colorPrimaryDark"
+        android:strokeColor="?attr/colorPrimaryDark"/>
+</vector>
\ No newline at end of file
diff --git a/app/src/main/res/layout-land/activity_audio_note.xml b/app/src/main/res/layout-land/activity_audio_note.xml
index b9d6c341..38e4cc96 100644
--- a/app/src/main/res/layout-land/activity_audio_note.xml
+++ b/app/src/main/res/layout-land/activity_audio_note.xml
@@ -30,7 +30,7 @@
                 android:id="@+id/btn_play_pause"
                 android:layout_width="48dp"
                 android:layout_height="48dp"
-                android:background="@drawable/ic_play_arrow_black_24dp"
+                android:background="@drawable/ic_play_arrow_icon_24dp"
                 android:padding="16dp"
                 android:visibility="invisible" />
 
@@ -38,7 +38,7 @@
                 android:id="@+id/btn_record"
                 android:layout_width="48dp"
                 android:layout_height="48dp"
-                android:background="@drawable/ic_mic_black_24dp"
+                android:background="@drawable/ic_mic_icon_24dp"
                 android:padding="16dp" />
         </FrameLayout>
 
diff --git a/app/src/main/res/layout/activity_about.xml b/app/src/main/res/layout/activity_about.xml
index 259b71b0..62754a4b 100644
--- a/app/src/main/res/layout/activity_about.xml
+++ b/app/src/main/res/layout/activity_about.xml
@@ -1,25 +1,25 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
-    android:layout_height="match_parent"
+    android:layout_height="fill_parent"
     android:layout_width="match_parent"
-    android:background="@color/white">
+    android:background="?attr/colorSurface">
 
     <LinearLayout
         android:id="@+id/main_content"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="#FFFFFF"
+        android:background="?attr/colorSurface"
         android:fitsSystemWindows="true"
         android:orientation="vertical"
         android:paddingBottom="@dimen/activity_vertical_margin"
         android:paddingLeft="@dimen/activity_horizontal_margin"
         android:paddingRight="@dimen/activity_horizontal_margin"
         android:paddingTop="@dimen/activity_vertical_margin"
-        tools:context=".ui.AboutActivity"
-        android:weightSum="1">
+        tools:context=".ui.AboutActivity">
 
         <LinearLayout
+            android:background="?attr/colorSurface"
             android:layout_width="match_parent"
             android:layout_weight="0.36"
             android:layout_height="wrap_content">
diff --git a/app/src/main/res/layout/activity_audio_note.xml b/app/src/main/res/layout/activity_audio_note.xml
index 1158393f..36bb2b4b 100644
--- a/app/src/main/res/layout/activity_audio_note.xml
+++ b/app/src/main/res/layout/activity_audio_note.xml
@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
@@ -26,7 +27,7 @@
             android:layout_gravity="center_horizontal"
             android:padding="16dp"
             android:id="@+id/btn_record"
-            android:background="@drawable/ic_mic_black_24dp" />
+            android:background="@drawable/ic_mic_icon_24dp" />
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
@@ -44,7 +45,7 @@
             android:padding="16dp"
             android:visibility="invisible"
             android:id="@+id/btn_play_pause"
-            android:background="@drawable/ic_play_arrow_black_24dp"/>
+            android:background="@drawable/ic_play_arrow_icon_24dp"/>
 
     </LinearLayout>
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 8e69e22f..bf3e097a 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -19,6 +19,7 @@
         android:layout_height="match_parent"
         android:layout_gravity="start"
         android:fitsSystemWindows="true"
+        android:background="?attr/colorBackground"
         app:headerLayout="@layout/nav_header_main"
         app:menu="@menu/activity_main_drawer" />
 
diff --git a/app/src/main/res/layout/nav_header_main.xml b/app/src/main/res/layout/nav_header_main.xml
index a514fb20..02a82dcd 100644
--- a/app/src/main/res/layout/nav_header_main.xml
+++ b/app/src/main/res/layout/nav_header_main.xml
@@ -2,37 +2,41 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="@dimen/nav_header_height"
-    android:background="@drawable/header"
+    android:background="?attr/colorNavbarHeaderBackground"
     android:gravity="bottom"
     android:orientation="vertical"
     android:paddingBottom="@dimen/activity_vertical_margin"
-    android:paddingLeft="@dimen/activity_horizontal_margin"
-    android:paddingRight="@dimen/activity_horizontal_margin"
     android:paddingTop="@dimen/activity_vertical_margin"
+    android:paddingLeft="@dimen/activity_vertical_margin"
+    android:paddingRight="@dimen/activity_vertical_margin"
     android:theme="@style/ThemeOverlay.AppCompat.Dark">
 
     <RelativeLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:orientation="horizontal">
+        android:orientation="horizontal"
+        android:background="?attr/colorNavbarHeaderSurface"
+        android:paddingTop="7dp"
+        android:paddingBottom="7dp">
 
         <ImageView
             android:id="@+id/imageView"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-
+            android:paddingStart="@dimen/activity_horizontal_margin"
+            android:paddingEnd="@dimen/activity_horizontal_margin"
             android:src="@mipmap/ic_drawer"/>
         <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:paddingLeft="@dimen/activity_horizontal_margin"
             android:text="@string/app_name"
-            android:textSize="18sp"
             android:textAppearance="@style/TextAppearance.AppCompat.Body1"
-            android:textColor="@color/colorPrimaryDark"
             android:layout_centerVertical="true"
             android:layout_toEndOf="@id/imageView"
-            android:layout_toRightOf="@id/imageView"/>
+            android:layout_toRightOf="@id/imageView"
+            android:textColor="?attr/colorNavbarHeaderText"
+            android:textSize="18sp"/>
 
     </RelativeLayout>
 
diff --git a/app/src/main/res/layout/note_header.xml b/app/src/main/res/layout/note_header.xml
index ae136e43..72853079 100644
--- a/app/src/main/res/layout/note_header.xml
+++ b/app/src/main/res/layout/note_header.xml
@@ -34,7 +34,9 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent"
             android:inputType="none"
-            android:singleLine="true"/>
+            android:singleLine="true"
+            android:textColor="?attr/editTextColor"
+            />
     </com.google.android.material.textfield.TextInputLayout>
 
 </LinearLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/note_item.xml b/app/src/main/res/layout/note_item.xml
index 44176335..d0f1277d 100644
--- a/app/src/main/res/layout/note_item.xml
+++ b/app/src/main/res/layout/note_item.xml
@@ -4,18 +4,22 @@
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:layout_marginTop="8dp"
-    android:layout_marginHorizontal="@dimen/activity_horizontal_margin">
+    android:layout_marginHorizontal="@dimen/activity_horizontal_margin"
+    app:cardBackgroundColor="?attr/colorSurface"
+    app:cardCornerRadius="8dp"
+    >
 
     <LinearLayout
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:padding="4dp"
         android:orientation="horizontal">
 
         <ImageView
             android:id="@+id/imageView_category"
             android:layout_width="35dp"
             android:layout_height="match_parent"
-            app:srcCompat="@drawable/ic_format_list_bulleted_black_24dp" />
+            app:srcCompat="@drawable/ic_format_list_bulleted_icon_24dp" />
 
 
         <LinearLayout
@@ -31,7 +35,8 @@
                 android:ellipsize="end"
                 android:maxLines="1"
                 android:text="Title"
-                android:textAppearance="@style/TextAppearance.AppCompat.Large" />
+                android:textAppearance="@style/TextAppearance.AppCompat.Large"
+                />
 
             <TextView
                 android:id="@+id/text_view_description"
diff --git a/app/src/main/res/layout/simple_spinner_item.xml b/app/src/main/res/layout/simple_spinner_item.xml
index 05de07a6..34cc93ce 100644
--- a/app/src/main/res/layout/simple_spinner_item.xml
+++ b/app/src/main/res/layout/simple_spinner_item.xml
@@ -6,5 +6,4 @@
     android:layout_height="wrap_content"
     android:ellipsize="marquee"
     android:textAlignment="inherit"
-    android:textColor="@color/black"
     android:backgroundTint="@color/red"/>
\ No newline at end of file
diff --git a/app/src/main/res/menu/activity_main_drawer.xml b/app/src/main/res/menu/activity_main_drawer.xml
index aa8bd675..a0cbfec1 100644
--- a/app/src/main/res/menu/activity_main_drawer.xml
+++ b/app/src/main/res/menu/activity_main_drawer.xml
@@ -18,7 +18,7 @@
 
         <item
             android:id="@+id/nav_all"
-            android:icon="@drawable/ic_format_list_bulleted_black_24dp"
+            android:icon="@drawable/ic_format_list_bulleted_icon_24dp"
             android:title="@string/nav_all"/>
     </group>
 
diff --git a/app/src/main/res/values-night/styles.xml b/app/src/main/res/values-night/styles.xml
new file mode 100644
index 00000000..2876dcd9
--- /dev/null
+++ b/app/src/main/res/values-night/styles.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <style name="AppTheme" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <item name="colorPrimary">@color/colorPrimary</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <item name="colorAccent">@color/colorAccent</item>
+        <item name="colorSurface">@color/colorSurfaceDark</item>
+        <item name="colorSurfaceSecondary">@color/colorSurfaceSecondaryDark</item>
+        <item name="colorBackground">@color/colorBackgroundDark</item>
+        <item name="colorOnBackground">@color/white</item>
+        <item name="android:windowBackground">@color/colorBackgroundDark</item>
+
+        <item name="colorNavbarHeaderBackground">@color/colorPrimaryDark</item>
+        <item name="colorNavbarHeaderSurface">#476885</item>
+        <item name="colorNavbarHeaderText">@color/white</item>
+
+        <item name="colorIconFill">@color/white</item>
+
+    </style>
+
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/arrays.xml b/app/src/main/res/values/arrays.xml
index 6b46c5bb..b7dc397a 100644
--- a/app/src/main/res/values/arrays.xml
+++ b/app/src/main/res/values/arrays.xml
@@ -47,4 +47,10 @@
         <item>30</item>
     </string-array>
 
+    <string-array name="array_day_night_theme_values">
+        <item>-1</item>
+        <item>1</item>
+        <item>2</item>
+    </string-array>
+
 </resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/attrs.xml b/app/src/main/res/values/attrs.xml
new file mode 100644
index 00000000..6b49c61d
--- /dev/null
+++ b/app/src/main/res/values/attrs.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <declare-styleable name="AppTheme">
+        <attr name="colorSurfaceSecondary" format="color" />
+        <attr name="colorBackground" format="color" />
+        <attr name="colorNavbarHeaderBackground" format="color" />
+        <attr name="colorNavbarHeaderSurface" format="color" />
+        <attr name="colorNavbarHeaderText" format="color"/>
+        <attr name="colorIconFill" format="color" />
+    </declare-styleable>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index ef80205e..8e50f5b7 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -3,6 +3,12 @@
     <!--> SecUSo colors:  <-->
     <color name="colorPrimary">#024265</color>
     <color name="colorPrimaryDark">#024265</color>
+    <color name="colorSurface">#FFFFFF</color>
+    <color name="colorSurfaceDark">#373a3d</color>
+    <color name="colorBackground">#FFFFFF</color>
+    <color name="colorBackgroundDark">#050a0f</color>
+    <color name="colorSurfaceSecondary">#FFFFFF</color>
+    <color name="colorSurfaceSecondaryDark">#222222</color>
     <color name="colorAccent">#0274B2</color>
     <color name="transparent">#00000000</color>
     <color name="middlegrey">#A8A8A8</color>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 82f783a3..2f51dd7b 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -154,5 +154,11 @@
     <string name="text_note_fab_menu_desc">Formatting</string>
     <string name="note_not_saved">Note not saved</string>
 
+    <string name="select_day_night_theme">Design</string>
+    <string-array name="array_day_night_theme">
+        <item>System</item>
+        <item>Light</item>
+        <item>Dark</item>
+    </string-array>
 
 </resources>
diff --git a/app/src/main/res/values/styles.xml b/app/src/main/res/values/styles.xml
index 0ee66388..a4ad8780 100644
--- a/app/src/main/res/values/styles.xml
+++ b/app/src/main/res/values/styles.xml
@@ -1,13 +1,22 @@
 <resources>
 
     <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.MaterialComponents.Light.DarkActionBar">
+    <style name="AppTheme" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
         <!-- Customize your theme here. -->
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="windowActionModeOverlay">true</item>
-        <item name="android:actionModeBackground">@color/colorPrimaryDark</item>
+        <item name="colorSurfaceSecondary">@color/colorSurface</item>
+        <item name="colorBackground">@color/colorBackground</item>
+        <item name="colorOnBackground">@color/black</item>
+        <item name="android:actionModeBackground">@color/colorBackgroundDark</item>
+
+        <item name="colorNavbarHeaderBackground">@color/colorAccent</item>
+        <item name="colorNavbarHeaderSurface">@color/colorSurface</item>
+        <item name="colorNavbarHeaderText">@color/colorAccent</item>
+
+        <item name="colorIconFill">@color/black</item>
     </style>
 
     <style name="AppTheme.NoActionBar">
diff --git a/app/src/main/res/xml/pref_settings.xml b/app/src/main/res/xml/pref_settings.xml
index a4e2cc68..8be37674 100644
--- a/app/src/main/res/xml/pref_settings.xml
+++ b/app/src/main/res/xml/pref_settings.xml
@@ -8,6 +8,14 @@
             android:summary="@string/settings_del_notes_sum"/>
     </PreferenceCategory>
     <PreferenceCategory android:title="@string/settings_appearance_heading">
+        <ListPreference
+            android:key="settings_day_night_theme"
+            android:title="@string/select_day_night_theme"
+            android:summary="%s"
+            android:defaultValue="-1"
+            android:entries="@array/array_day_night_theme"
+            android:entryValues="@array/array_day_night_theme_values"
+            />
         <SwitchPreference
             android:key="settings_use_custom_font_size"
             android:defaultValue="false"
diff --git a/backup-api b/backup-api
index 8687a8db..eb4fad72 160000
--- a/backup-api
+++ b/backup-api
@@ -1 +1 @@
-Subproject commit 8687a8dbd170866707dc41bcb879375400ef697a
+Subproject commit eb4fad7252272b6e2da165f08542cebaa465c74d