title: How to add some pixels to the current height of div
body: <p>I want to increase the height of the div to be rendered 10px additional in advance from the auto.
  in CSS I have set the height of div to auto</p>
  <p>css :</p>
  <pre><code>div {
    height: auto;
  }
  </code></pre>
  <p>But I want like this:</p>
  <pre><code> div {
        height: auto + 10px;
      }
  </code></pre>