diff --git a/media_source/templates/administrator/atum/scss/blocks/_shepard-modals.scss b/media_source/templates/administrator/atum/scss/blocks/_shepard-modals.scss
index ee442216d029e..105eaf09b755b 100644
--- a/media_source/templates/administrator/atum/scss/blocks/_shepard-modals.scss
+++ b/media_source/templates/administrator/atum/scss/blocks/_shepard-modals.scss
@@ -6,6 +6,17 @@
   color: var(--body-color) !important;
 }
 
+// Cancel icon: opaque colour, >= 3:1 against the header (WCAG 1.4.11)
+.shepherd-cancel-icon,
+.shepherd-has-title .shepherd-content .shepherd-cancel-icon {
+  color: #6c6c6c !important;
+
+  &:hover,
+  &:focus-visible {
+    color: #000 !important;
+  }
+}
+
 @if $enable-dark-mode {
   @include color-mode(dark) {
     .shepherd-element, .shepherd-arrow:before {
diff --git a/media_source/templates/administrator/atum/scss/pages/_com_users.scss b/media_source/templates/administrator/atum/scss/pages/_com_users.scss
index 4428bc1462259..47398449f83a1 100644
--- a/media_source/templates/administrator/atum/scss/pages/_com_users.scss
+++ b/media_source/templates/administrator/atum/scss/pages/_com_users.scss
@@ -1,5 +1,12 @@
 // com_users
 
+// Default-method star: darker gold in light mode for >= 3:1 non-text contrast (WCAG 1.4.11)
+@include color-mode(light) {
+  .com_users #com-users-methods-list-method-default-badge-small {
+    color: #b07a00 !important;
+  }
+}
+
 .com_users {
 
   &.view-debuggroup,
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 cbd3abed8dae0..8a4a2c3ab593f 100644
--- a/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss
+++ b/media_source/templates/administrator/atum/scss/vendor/choicesjs/choices.scss
@@ -117,7 +117,7 @@
   cursor: pointer;
   background: none;
   border: 0;
-  opacity: .5;
+  opacity: .75;
   appearance: none;
 
   &::before {
@@ -203,7 +203,7 @@
     margin-block-start: -10px;
     margin-inline-end: 50px;
     border-radius: 10em;
-    opacity: .5;
+    opacity: .75;
 
     &:hover,
     &:focus {