diff --git a/install-usercss/install-usercss.css b/install-usercss/install-usercss.css
index 6da618f6..1d3613dc 100644
--- a/install-usercss/install-usercss.css
+++ b/install-usercss/install-usercss.css
@@ -494,5 +494,6 @@ li {
 @media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
   .install:after {
     background-image: url(../images/icon/32.png);
+    background-size: 16px 16px;
   }
 }