diff --git a/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss b/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss
index 1c63d20cebda..f2127bdfeef4 100644
--- a/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss
+++ b/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss
@@ -119,7 +119,7 @@
   cursor: pointer;
   background: none;
   border: 0;
-  opacity: .5;
+  opacity: .75;
   appearance: none;
   inline-size: 24px;
   block-size: 24px;
@@ -209,7 +209,7 @@
     margin-block-start: -10px;
     margin-inline-end: 50px;
     border-radius: 10em;
-    opacity: .5;
+    opacity: .75;
 
     &:hover,
     &:focus {
@@ -226,6 +226,21 @@
   }
 }
 
+// Remove button: >= 3:1 against the dark item background (WCAG 1.4.11)
+@if $enable-dark-mode {
+  @include color-mode(dark) {
+    .choices__button_joomla,
+    .choices[data-type*="select-one"] .choices__button_joomla {
+      opacity: .9;
+
+      &:hover,
+      &:focus {
+        opacity: 1;
+      }
+    }
+  }
+}
+
 .choices[data-type*="select-multiple"],
 .choices[data-type*="text"] {
   .choices__input {