diff --git a/web/viewer.css b/web/viewer.css
index 439ec8ca3..97e6c742e 100644
--- a/web/viewer.css
+++ b/web/viewer.css
@@ -29,6 +29,7 @@ select {
 
 #viewerContainer:-webkit-full-screen {
   top: 0px;
+  border-top: 5px solid transparent;
   background-color: #404040;
   background-image: url(images/texture.png);
   width: 100%;
@@ -37,6 +38,8 @@ select {
 }
 
 #viewerContainer:-moz-full-screen {
+  top: 0px;
+  border-top: 5px solid transparent;
   background-color: #404040;
   background-image: url(images/texture.png);
   width: 100%;