don't hide overflow, that causes worse problems

customize.dist/main.css

@@ -494,7 +494,6 @@ html.cp,
   color: #555;
   font-family: Georgia,Cambria,serif;
   height: 100%;
-  overflow-x: hidden;
 }
 .cp {
   /* buttons */

customize.dist/src/less/cryptpad.less

@@ -15,7 +15,6 @@ html.cp, .cp body {
 
     font-family: Georgia,Cambria,serif;
     height: 100%;
-    overflow-x: hidden;
 }
 
 .cp {