Answer by Steve Bennett for Unicode character for "X" cancel / close?

This is probably pedantry, but so far no one has really given a solution "to create a close button using CSS only." only. Here you go:

#close:before {  content: "✖";  border: 1px solid gray;  background-color:#eee;  padding:0.5em;  cursor: pointer;}

http://codepen.io/anon/pen/VaWqYg