title: Changing the background colour of an active input selector
body: <p>Any reason why when I run this code,</p>
  
  <pre><code>input[type=submit]:active {
    background-color: green;
  }
  </code></pre>
  
  <p>when I click the desired button it only flashes green for a split second and then returns to the original colour? How can I keep it permanently green?</p>