diff --git a/less/window.less b/less/window.less
index 18aa2366172..2012cf0c5f0 100644
--- a/less/window.less
+++ b/less/window.less
@@ -61,7 +61,7 @@ html,
     left: 0;
     right: 0;
     bottom: 0;
-    background: linear-gradient(to top, rgb(125, 125, 125) 0%, rgba(255, 255, 255, .3) 60%);
+    background: linear-gradient(to top, rgba(0, 0, 0, .5) 0%, rgba(0, 0, 0, 0) 100%);
     display: block;
     opacity: 0;
     transition: opacity .2s ease-in; // TODO: get from theme.tab