diff --git a/data/theme/gnome-shell.css b/data/theme/gnome-shell.css
index 518e04352..2da9cc2f8 100644
--- a/data/theme/gnome-shell.css
+++ b/data/theme/gnome-shell.css
@@ -265,10 +265,10 @@ StTooltip StLabel {
 }
 
 .workspace-thumbnails-background {
-    border: 1px solid #424242;
+    border: 1px solid rgba(128, 128, 128, 0.4);
     border-right: 0px;
     border-radius: 9px 0px 0px 9px;
-    background: #071524;
+    background-color: rgba(0, 0, 0, 0.5);
     padding: 8px;
 }