diff --git a/aqt/toolbar.py b/aqt/toolbar.py
index 8f8e31cf8..085690fec 100644
--- a/aqt/toolbar.py
+++ b/aqt/toolbar.py
@@ -115,10 +115,17 @@ margin-top: 4px;
 font-weight: bold;
 }
 
-body {
+html {
+height: 100%;
 background: -webkit-gradient(linear, left top, left bottom,
   from(#ddd), to(#fff));
-margin: 0; padding: 0;
+margin:0; padding:0;
+}
+
+body {
+margin:0; padding:0;
+position:absolute;
+top:0;left:0;right:0;bottom:0;
 -webkit-user-select: none;
 border-bottom: 1px solid #aaa;
 }