Limit the dropdown's height and make it scrollable

Signed-off-by: Johannes Marbach <n0-0ne+github@mailbox.org>

assets/scss/_styles_project.scss

@@ -51,6 +51,12 @@ Custom SCSS for the Matrix spec
     color: $black;
   }
 
+  /* Make the version dropdown scroll if its too large */
+  ul#version-selector {
+    max-height: 80vh;
+    overflow-y: auto;
+  }
+
   ul#version-selector li.selected a {
     color: $secondary;
   }