title: ng-select angular 5 change background color on hover for items in the option list
body: <p>I am trying to change the background color of the item in the option list on :hover. I notice that there is a marked class that gets added to the div tag on hover. </p>
  
  <p>I have this in my angular component that is using the ng-select component:</p>
  
  <pre><code> ng-select {
      .ng-option {
        .marked {
          background-color: red;
        }
      }
    }
  </code></pre>
  
  <p>It is not working. What is the best way to handle changing the background color on hover for ng-select</p>