diff --git a/css/mistakes.css b/css/mistakes.css
index dc95846..6ab5eb7 100644
--- a/css/mistakes.css
+++ b/css/mistakes.css
@@ -20,6 +20,12 @@ body {
   float:left;
   position:relative;
   width:50%;
+  -webkit-touch-callout: none;
+  -webkit-user-select: none;
+  -khtml-user-select: none;
+  -moz-user-select: none;
+  -ms-user-select: none;
+  user-select: none;
 }
 
 .right {