Fix user-select on Safari

Author: stasm

index.html

@@ -14,6 +14,7 @@
         width: 100vw;
         height: 100vh;
         user-select: none;
+        -webkit-user-select: none;
         overflow: auto;
     }
     #debug {

play/index.html

@@ -15,6 +15,7 @@
         width: 100vw;
         height: 100vh;
         user-select: none;
+        -webkit-user-select: none;
         overflow: auto;
     }