diff --git a/src/main/javadoc/custom-javadoc.css b/src/main/javadoc/custom-javadoc.css
index df0c9006..2532d909 100644
--- a/src/main/javadoc/custom-javadoc.css
+++ b/src/main/javadoc/custom-javadoc.css
@@ -66,6 +66,13 @@ select#version-switcher option {
   font-weight: normal;
 }
 
+select#version-switcher[aria-busy="true"] {
+  background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpath d='M21 12a9 9 0 1 1-6.219-8.56'%3e%3c/path%3e%3canimateTransform attributeName='transform' type='rotate' from='0 12 12' to='360 12 12' dur='1s' repeatCount='indefinite'/%3e%3c/svg%3e") !important;
+  background-repeat: no-repeat !important;
+  background-position: right 8px center !important;
+  background-size: 14px !important;
+}
+
 select#version-switcher:disabled {
   opacity: 0.7;
   cursor: wait;