diff --git a/theme/boost/scss/moodle/contentbank.scss b/theme/boost/scss/moodle/contentbank.scss
index 92afeb41cba..6a56e53d84a 100644
--- a/theme/boost/scss/moodle/contentbank.scss
+++ b/theme/boost/scss/moodle/contentbank.scss
@@ -50,7 +50,7 @@
         }
 
         .cb-unlisted .cb-thumbnail {
-            opacity: .3;
+            opacity: .15;
         }
 
         /* Display a centered eye slash on top of unlisted content icons. */
@@ -63,7 +63,8 @@
             font-family: FontAwesome;
             font-size: 26px;
             text-align: center;
-            opacity: 0.8;
+            opacity: 0.9;
+            text-shadow: 0 0 10px $body-bg;
         }
 
         .cb-heading,
diff --git a/theme/boost/style/moodle.css b/theme/boost/style/moodle.css
index ee526e2d5e6..12393365eb8 100644
--- a/theme/boost/style/moodle.css
+++ b/theme/boost/style/moodle.css
@@ -13139,7 +13139,7 @@ table.calendartable caption {
     margin-right: auto;
     margin-bottom: 0.5rem; }
   .content-bank-container.view-grid .cb-unlisted .cb-thumbnail {
-    opacity: .3; }
+    opacity: .15; }
   .content-bank-container.view-grid .cb-unlisted::after {
     position: absolute;
     top: 20px;
@@ -13149,7 +13149,8 @@ table.calendartable caption {
     font-family: FontAwesome;
     font-size: 26px;
     text-align: center;
-    opacity: 0.8; }
+    opacity: 0.9;
+    text-shadow: 0 0 10px #fff; }
   .content-bank-container.view-grid .cb-heading,
   .content-bank-container.view-grid .cb-uses,
   .content-bank-container.view-grid .cb-date,
diff --git a/theme/classic/style/moodle.css b/theme/classic/style/moodle.css
index 95975c587ba..ff3990bb372 100644
--- a/theme/classic/style/moodle.css
+++ b/theme/classic/style/moodle.css
@@ -13353,7 +13353,7 @@ table.calendartable caption {
     margin-right: auto;
     margin-bottom: 0.5rem; }
   .content-bank-container.view-grid .cb-unlisted .cb-thumbnail {
-    opacity: .3; }
+    opacity: .15; }
   .content-bank-container.view-grid .cb-unlisted::after {
     position: absolute;
     top: 20px;
@@ -13363,7 +13363,8 @@ table.calendartable caption {
     font-family: FontAwesome;
     font-size: 26px;
     text-align: center;
-    opacity: 0.8; }
+    opacity: 0.9;
+    text-shadow: 0 0 10px #fff; }
   .content-bank-container.view-grid .cb-heading,
   .content-bank-container.view-grid .cb-uses,
   .content-bank-container.view-grid .cb-date,