Effect How to - Make a hover effect for pseudo elements

Question

We would like to know how to make a hover effect for pseudo elements.

Answer


<!DOCTYPE html>
<html>
<head>
<style type='text/css'>
#button {<!--from  www  .java 2  s  . c om-->
  display: block;
  height: 25px;
  margin: 0 10px;
  padding: 10px;
  text-indent: 20px;
  width: 12%;
}

#button:before {
  background-color: blue;
  content: "";
  display: block;
  height: 25px;
  width: 25px;
}

#button:hover:before {
  background-color: red;
}
</style>
</head>
<body>
  <div id="button">Button</div>
</body>
</html>

The code above is rendered as follows: