diff --git a/css/app.css b/css/app.css
index b039bfa03..5948a52c5 100644
--- a/css/app.css
+++ b/css/app.css
@@ -1128,6 +1128,10 @@ img.tile {
     -webkit-transform-origin:0 0;
     -moz-transform-origin:0 0;
     -o-transform-origin:0 0;
+    -moz-user-select: none;
+    -webkit-user-select: none;
+    -ms-user-select: none;
+    user-select: none;
 }
 
 #surface {