diff --git a/docs/working-notes/todo3.md b/docs/working-notes/todo3.md
index de82124..4ec177c 100644
--- a/docs/working-notes/todo3.md
+++ b/docs/working-notes/todo3.md
@@ -437,10 +437,13 @@ open images in new tab and check all sizes
 links in md colors
 fix table of contents styling
 retest vertical spacing, font-size and content width
+
 // maybe
-astro transitions 
+    astro transitions, works for PostCard on blog, tags, categories, explore
 --------
 
 ask about optimal max-width image width
 fix .mdx live reload
+firefox has white flash bug on theme change after transitions, https://youtu.be/9MChTVlXbf8?t=363
+
 ```
diff --git a/src/components/BaseHead.astro b/src/components/BaseHead.astro
index b02dbb9..717e993 100644
--- a/src/components/BaseHead.astro
+++ b/src/components/BaseHead.astro
@@ -106,5 +106,5 @@ const ogImageUrl = new URL(image, baseUrl);
   <script src="set-url-here" crossorigin="anonymous"></script>
  -->
 
-  <ViewTransitions />
+  <ViewTransitions fallback="none" />
 </head>
diff --git a/src/components/PostCard.astro b/src/components/PostCard.astro
index 99f27aa..d39bb79 100644
--- a/src/components/PostCard.astro
+++ b/src/components/PostCard.astro
@@ -9,6 +9,7 @@ import TagList from '@/components/TagList.astro';
 import { draftText } from '@/constants/data';
 import { IMAGE_SIZES } from '@/constants/image';
 import { ROUTES } from '@/constants/routes';
+import { setTransitionSlug, TRANSITION_ELEMENT_IDS } from '@/constants/transitions';
 import { formatDate, formatDateIso } from '@/utils/datetime';
 import { cn } from '@/utils/styles';
 
@@ -39,6 +40,8 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
   publishDate,
   updatedDate,
 });
+
+const getTransitionNameFromElementId = setTransitionSlug({ pageSlug: slug });
 ---
 
 <article
@@ -58,7 +61,9 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
           alt={heroAlt}
           itemprop="image"
           class="w-full h-[168px] xs:h-[250px] md:h-[168px] md:max-w-[298px] object-cover rounded-box"
-          transition:name={`hero-image-${slug}`}
+          transition:name={getTransitionNameFromElementId({
+            elementId: TRANSITION_ELEMENT_IDS.POST_CARD.HERO_IMAGE,
+          })}
         />
       </div>
     )
@@ -67,7 +72,12 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
   {/* right column */}
   <div class={cn('flex flex-col', { 'md:basis-2/3': !noHero })}>
     {/* category and publishDate row*/}
-    <div class="flex items-start justify-between mb-4 text-sm leading-none">
+    <div
+      class="flex items-start justify-between mb-4 text-sm leading-none"
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.META,
+      })}
+    >
       <Link
         href={`${ROUTES.CATEGORIES}${category}`}
         class="inline-flex items-center gap-2 bg-primary-base-200 font-medium px-2 py-0.5 rounded-button"
@@ -87,14 +97,30 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
     </div>
 
     {/* title */}
-    <h2 class="text-2xl font-bold break-words md:line-clamp-2 mt-0 mb-2">
+    <h2
+      class="text-2xl font-bold break-words md:line-clamp-2 mt-0 mb-2"
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.TITLE,
+      })}
+    >
       <Link href={`${ROUTES.BLOG}${slug}`} variant="link-heading">
         {title}
         {draft && <sup class="text-sm text-red-500 ml-1">{draftText}</sup>}
       </Link>
     </h2>
 
-    {description && <p class="text-base mb-4 line-clamp-2">{description}</p>}
+    {
+      description && (
+        <p
+          class="text-base mb-4 line-clamp-2"
+          transition:name={getTransitionNameFromElementId({
+            elementId: TRANSITION_ELEMENT_IDS.POST_CARD.DESCRIPTION,
+          })}
+        >
+          {description}
+        </p>
+      )
+    }
 
     {/* reading time and read more link */}
     <div class="flex items-center xs:items-end justify-between">
diff --git a/src/components/PostCardSmall.astro b/src/components/PostCardSmall.astro
index 5bfecf1..b761199 100644
--- a/src/components/PostCardSmall.astro
+++ b/src/components/PostCardSmall.astro
@@ -7,6 +7,7 @@ import Link from '@/components/Link.astro';
 import { draftText } from '@/constants/data';
 import { IMAGE_SIZES } from '@/constants/image';
 import { ROUTES } from '@/constants/routes';
+import { setTransitionSlug, TRANSITION_ELEMENT_IDS } from '@/constants/transitions';
 import { formatDate, formatDateIso } from '@/utils/datetime';
 import { cn } from '@/utils/styles';
 
@@ -25,6 +26,8 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
   publishDate,
   updatedDate,
 });
+
+const getTransitionNameFromElementId = setTransitionSlug({ pageSlug: slug });
 ---
 
 <article
@@ -40,16 +43,40 @@ const { lastAccessDate, isUpdatedDate } = getPublishedOrUpdatedDate({
     src={heroImage}
     alt={heroAlt}
     class="object-cover rounded-box hidden xs:block"
+    transition:name={getTransitionNameFromElementId({
+      elementId: TRANSITION_ELEMENT_IDS.POST_CARD.HERO_IMAGE,
+    })}
   />
   <div>
-    <h4 class="b-h4 text-xl leading-none line-clamp-1 mb-1">
+    <h4
+      class="b-h4 text-xl leading-none line-clamp-1 mb-1"
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.TITLE,
+      })}
+    >
       <Link variant="link-heading" href={`${ROUTES.BLOG}${slug}`}>
         {draft && <sup class="text-sm text-red-500 mr-1">{draftText}</sup>}
         {title}
       </Link>
     </h4>
-    {description && <p class="text-base text-captions line-clamp-1 mb-2">{description}</p>}
-    <span class="inline-flex items-center gap-1 text-sm text-captions text-nowrap">
+    {
+      description && (
+        <p
+          class="text-base text-captions line-clamp-1 mb-2"
+          transition:name={getTransitionNameFromElementId({
+            elementId: TRANSITION_ELEMENT_IDS.POST_CARD.DESCRIPTION,
+          })}
+        >
+          {description}
+        </p>
+      )
+    }
+    <span
+      class="inline-flex items-center gap-1 text-sm text-captions text-nowrap"
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.META,
+      })}
+    >
       <Icon name={isUpdatedDate ? 'mdi:edit-outline' : 'mdi:access-time'} class="w-4 h-4" />
       <time itemprop="datePublished" datetime={formatDateIso(lastAccessDate)}>
         {formatDate(lastAccessDate)}
diff --git a/src/components/ThemeScript.astro b/src/components/ThemeScript.astro
index 73dc769..6a83aeb 100644
--- a/src/components/ThemeScript.astro
+++ b/src/components/ThemeScript.astro
@@ -102,6 +102,7 @@ import * as themeConstants from '@/constants/themes';
   // initial setup
   setTheme(getUserPreference());
 
+  // fails in firefox
   // View Transitions hook to restore theme
   document.addEventListener('astro:after-swap', () => setTheme(getUserPreference()));
 
diff --git a/src/config.ts b/src/config.ts
index 05fb167..91f911d 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -32,7 +32,8 @@ const configData: ConfigType = {
   SITE_URL: process.env.SITE_URL,
   SITE_TITLE: 'Nemanja Mitic',
   SITE_DESCRIPTION: 'I am Nemanja, full stack developer',
-  PAGE_SIZE: { POST_CARD: 3, POST_CARD_SMALL: 10 },
+  PAGE_SIZE_POST_CARD: 3,
+  PAGE_SIZE_POST_CARD_SMALL: 10,
   MORE_POSTS_COUNT: 3,
   AUTHOR_NAME: 'Nemanja Mitic',
   AUTHOR_EMAIL: 'email@email.com',
diff --git a/src/constants/transitions.ts b/src/constants/transitions.ts
new file mode 100644
index 0000000..247a759
--- /dev/null
+++ b/src/constants/transitions.ts
@@ -0,0 +1,28 @@
+export interface TransitionNameArgs {
+  elementId: string;
+  pageSlug: string;
+}
+
+export type TransitionElementId = Pick<TransitionNameArgs, 'elementId'>;
+export type TransitionPageSlug = Pick<TransitionNameArgs, 'pageSlug'>;
+
+export const getTransitionName = ({ elementId, pageSlug }: TransitionNameArgs): string =>
+  `${elementId}-${pageSlug}`;
+
+/** apply only slug, returns getTransitionNameFromElementId({elementId}) function */
+export const setTransitionSlug =
+  ({ pageSlug }: TransitionPageSlug) =>
+  ({ elementId }: TransitionElementId) =>
+    getTransitionName({ elementId, pageSlug });
+
+export const TRANSITION_ELEMENT_IDS = {
+  POST_CARD: {
+    HERO_IMAGE: 'post-card-hero-image',
+    TITLE: 'post-card-title',
+    DESCRIPTION: 'post-card-description',
+    META: 'post-card-meta',
+  },
+  EXPLORE: {
+    YEAR: 'explore-year',
+  },
+} as const;
diff --git a/src/pages/blog/[...page].astro b/src/pages/blog/[...page].astro
index 5b1b490..1bb480f 100644
--- a/src/pages/blog/[...page].astro
+++ b/src/pages/blog/[...page].astro
@@ -12,7 +12,7 @@ import type { GetStaticPathsOptions } from 'astro';
 // [page].astro and getStaticPaths because of pagination
 export async function getStaticPaths({ paginate }: GetStaticPathsOptions) {
   const posts: Post[] = await getAllPostsWithReadingTime();
-  const pageSize = CONFIG.PAGE_SIZE.POST_CARD; // must take entire config here, interesting
+  const pageSize = CONFIG.PAGE_SIZE_POST_CARD; // must take entire config here, interesting
 
   const pagination = paginate(posts, { pageSize });
   pagination.push({ params: { page: '1' }, props: pagination[0].props });
diff --git a/src/pages/blog/[slug].astro b/src/pages/blog/[slug].astro
index cb5add5..10faa81 100644
--- a/src/pages/blog/[slug].astro
+++ b/src/pages/blog/[slug].astro
@@ -14,6 +14,7 @@ import TagList from '@/components/TagList.astro';
 import { draftText } from '@/constants/data';
 import { IMAGE_SIZES } from '@/constants/image';
 import { ROUTES } from '@/constants/routes';
+import { setTransitionSlug, TRANSITION_ELEMENT_IDS } from '@/constants/transitions';
 import { CONFIG } from '@/config';
 import { getOpenGraphImagePath } from '@/libs/api/open-graph/image-path';
 
@@ -72,6 +73,8 @@ const shareProps = {
   url: `${SITE_URL}${ROUTES.BLOG}${slug}`,
 };
 
+const getTransitionNameFromElementId = setTransitionSlug({ pageSlug: slug });
+
 // handle all metadata here
 const image = getOpenGraphImagePath(pathname);
 
@@ -91,25 +94,44 @@ const metadata: Metadata = { title, description, image };
           loading="eager"
           itemprop="image"
           class="block max-w-full h-auto aspect-[16/8] object-cover"
-          transition:name={`hero-image-${slug}`}
+          transition:name={getTransitionNameFromElementId({
+            elementId: TRANSITION_ELEMENT_IDS.POST_CARD.HERO_IMAGE,
+          })}
         />
       )
     }
   </Fragment>
 
   <Fragment slot="hero-text">
-    <h1 class="b-h1">
+    <h1
+      class="b-h1"
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.TITLE,
+      })}
+    >
       {title}
       {draft && <sup class="text-red-500 ml-1">{draftText}</sup>}
     </h1>
 
     {
       description && (
-        <p class="font-normal text-content text-xl md:text-2xl mb-6 md:mb-8">{description}</p>
+        <p
+          class="font-normal text-content text-xl md:text-2xl mb-6 md:mb-8"
+          transition:name={getTransitionNameFromElementId({
+            elementId: TRANSITION_ELEMENT_IDS.POST_CARD.DESCRIPTION,
+          })}
+        >
+          {description}
+        </p>
       )
     }
 
-    <PostMeta {...postMetaProps} />
+    <PostMeta
+      {...postMetaProps}
+      transition:name={getTransitionNameFromElementId({
+        elementId: TRANSITION_ELEMENT_IDS.POST_CARD.META,
+      })}
+    />
   </Fragment>
 
   <Fragment slot="content">
diff --git a/src/pages/blog/categories/[category]/[...page].astro b/src/pages/blog/categories/[category]/[...page].astro
index af3abc5..9b3d657 100644
--- a/src/pages/blog/categories/[category]/[...page].astro
+++ b/src/pages/blog/categories/[category]/[...page].astro
@@ -16,7 +16,7 @@ import type { GetStaticPathsOptions } from 'astro';
 
 export async function getStaticPaths({ paginate }: GetStaticPathsOptions) {
   const posts: Post[] = await getAllPostsWithReadingTime();
-  const pageSize = CONFIG.PAGE_SIZE.POST_CARD;
+  const pageSize = CONFIG.PAGE_SIZE_POST_CARD;
 
   const uniqueCategories = getUniqueCategories(posts);
 
diff --git a/src/pages/blog/explore/[...filter]/[...page].astro b/src/pages/blog/explore/[...filter]/[...page].astro
index 3f6ca5c..499695f 100644
--- a/src/pages/blog/explore/[...filter]/[...page].astro
+++ b/src/pages/blog/explore/[...filter]/[...page].astro
@@ -6,6 +6,7 @@ import { getUniqueTags } from '@/modules/post/tag';
 import List from '@/layouts/List.astro';
 import Explore from '@/components/Explore.astro';
 import PostCardSmall from '@/components/PostCardSmall.astro';
+import { getTransitionName, TRANSITION_ELEMENT_IDS } from '@/constants/transitions';
 import { CONFIG } from '@/config';
 import { getPageMetadata } from '@/utils/metadata';
 import { pickPaginationPropsFromPage } from '@/utils/pagination';
@@ -16,7 +17,7 @@ import type { GetStaticPathsOptions } from 'astro';
 
 export async function getStaticPaths({ paginate }: GetStaticPathsOptions) {
   const posts: Post[] = await getAllPostsWithReadingTime();
-  const pageSize = CONFIG.PAGE_SIZE.POST_CARD_SMALL;
+  const pageSize = CONFIG.PAGE_SIZE_POST_CARD_SMALL;
 
   // grouping is outside of getStaticPaths
 
@@ -92,7 +93,15 @@ const postsByYear = groupPostsByYear(paginatedPosts);
     {
       postsByYear.years.map((year) => (
         <>
-          <h2 class="b-h2">{year}</h2>
+          <h2
+            class="b-h2"
+            transition:name={getTransitionName({
+              elementId: TRANSITION_ELEMENT_IDS.EXPLORE.YEAR,
+              pageSlug: year,
+            })}
+          >
+            {year}
+          </h2>
           <div>
             {postsByYear.posts[year].map((post) => (
               <PostCardSmall {post} class="last:mb-6" />
diff --git a/src/pages/blog/tags/[tag]/[...page].astro b/src/pages/blog/tags/[tag]/[...page].astro
index 20283a2..9f88210 100644
--- a/src/pages/blog/tags/[tag]/[...page].astro
+++ b/src/pages/blog/tags/[tag]/[...page].astro
@@ -15,7 +15,7 @@ import type { GetStaticPathsOptions } from 'astro';
 
 export async function getStaticPaths({ paginate }: GetStaticPathsOptions) {
   const posts: Post[] = await getAllPostsWithReadingTime();
-  const pageSize = CONFIG.PAGE_SIZE.POST_CARD;
+  const pageSize = CONFIG.PAGE_SIZE_POST_CARD;
 
   const uniqueTags = getUniqueTags(posts);
 
diff --git a/src/pages/projects/[...page].astro b/src/pages/projects/[...page].astro
index d468504..3245b9f 100644
--- a/src/pages/projects/[...page].astro
+++ b/src/pages/projects/[...page].astro
@@ -11,7 +11,7 @@ import type { GetStaticPathsOptions, Page } from 'astro';
 
 export async function getStaticPaths({ paginate }: GetStaticPathsOptions) {
   const sortedProjects = await getAllProjects();
-  const pageSize = CONFIG.PAGE_SIZE.POST_CARD;
+  const pageSize = CONFIG.PAGE_SIZE_POST_CARD;
 
   const pagination = paginate(sortedProjects, { pageSize });
   pagination.push({ params: { page: '1' }, props: pagination[0].props });
diff --git a/src/schemas/config.ts b/src/schemas/config.ts
index 940d529..0952edd 100644
--- a/src/schemas/config.ts
+++ b/src/schemas/config.ts
@@ -13,10 +13,8 @@ export const configSchema = z.object({
   SITE_URL: z.string().url().regex(/[^/]$/, 'SITE_URL should not end with a slash "/"'),
   SITE_TITLE: z.string().min(1),
   SITE_DESCRIPTION: z.string().min(1),
-  PAGE_SIZE: z.object({
-    POST_CARD: z.number(),
-    POST_CARD_SMALL: z.number(),
-  }),
+  PAGE_SIZE_POST_CARD: z.number(),
+  PAGE_SIZE_POST_CARD_SMALL: z.number(),
   MORE_POSTS_COUNT: z.number(),
   AUTHOR_NAME: z.string().min(1),
   AUTHOR_EMAIL: z.string().email(),