title: how to change css value
body: <p>I have a class in css file like this</p>
  
  <pre><code>#current a::after {
      background: #fff;
      z-index: 3;
  }
  </code></pre>
  
  <p>I need to change backround color by clicking on checkbox</p>
  
  <pre><code>$(document).ready(function(){
      $(".element" ).click(function(){    
  
          $("#current a::after").css("background-color:", "red");     
  
      });
  </code></pre>
  
  <p>What is the right syntax of my code? </p>