How to change background-color of a clicked button in css

To change the background color of a button that has been clicked, use background-color property. The example is given below.

Change button's background-color on hover

Create a html button element with a class named .btn. To change button's background color on hover use the :hover pseudo class Inside the style tag.

<style>
  .btn:hover {     
    background-color:green;    
  }
</style>

Change button background color using focus pseudo class.