diff --git a/src/main/java/com/flowingcode/vaadin/addons/demo/SourceCodeViewer.java b/src/main/java/com/flowingcode/vaadin/addons/demo/SourceCodeViewer.java
index d8616b1..beb1786 100644
--- a/src/main/java/com/flowingcode/vaadin/addons/demo/SourceCodeViewer.java
+++ b/src/main/java/com/flowingcode/vaadin/addons/demo/SourceCodeViewer.java
@@ -50,6 +50,7 @@ public SourceCodeViewer(String sourceUrl, Map<String, String> properties) {
   public SourceCodeViewer(String url, String language, Map<String, String> properties) {
     codeViewer = new Element("code-viewer");
     getElement().appendChild(codeViewer);
+    getElement().getStyle().set("overflow", "auto");
     getElement().getStyle().set("display", "flex");
     codeViewer.getStyle().set("flex-grow", "1");
     setProperties(properties);