Draw an X in CSS

 

You could just put the letter X in the HTML inside the div and then style it with css.

See JSFiddle: http://jsfiddle.net/uSwbN/

HTML:

<div id="orangeBox">
  <span id="x">X</span>
</div>

CSS:

#orangeBox {
  background: #f90;
  color: #fff;
  font-family: 'Helvetica', 'Arial', sans-serif;
  font-size: 2em;
  font-weight: bold;
  text-align: center;
  width: 40px;
  height: 40px;
  border-radius: 5px;
}