diff --git a/apps/common/main/resources/less/window.less b/apps/common/main/resources/less/window.less
index 351069a5c..b6afa837e 100644
--- a/apps/common/main/resources/less/window.less
+++ b/apps/common/main/resources/less/window.less
@@ -14,7 +14,7 @@
     left: 0;
     width: 100%;
     height: 100%;
-    opacity: 0;
+    opacity: 0.2;
     background-color: rgb(0,0,0);
     z-index: @zindex-modal - 1;
 }