Icône CSS pleine écran CSS

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  </head><!--from   ww  w .ja v a 2  s.  com-->
  <body>
    <div class="container">
      <h2>Fullscreen Glyph</h2>
      <p>Fullscreen icon: <span class="glyphicon glyphicon-fullscreen"></span></p>
      <p>Fullscreen icon as a link:
        <a href="#">
          <span class="glyphicon glyphicon-fullscreen"></span>
        </a>
      </p>
      <p>Fullscreen icon on a button:
        <button type="button" class="btn btn-default btn-sm">
          <span class="glyphicon glyphicon-fullscreen"></span> 
        </button>
      </p>
      <p>Fullscreen icon on a styled link button:
        <a href="#" class="btn btn-info btn-lg">
          <span class="glyphicon glyphicon-fullscreen"></span> Fullscreen
        </a>
      </p>
      <p>Unicode:
        <span class="glyphicon">&amp;#xe140;</span>
      </p>
    </div>
  </body>
</html>
Jose Polonia