diff --git a/guacamole/src/main/webapp/styles/client.css b/guacamole/src/main/webapp/styles/client.css
index 70b52f80c..bf5d0d837 100644
--- a/guacamole/src/main/webapp/styles/client.css
+++ b/guacamole/src/main/webapp/styles/client.css
@@ -55,6 +55,7 @@ div.dialogOuter {
     position: fixed;
     left: 0;
     top: 0;
+    background: rgba(0, 0, 0, 0.75);
 }
 
 div.dialogMiddle {