title: How I can organize four absolute div with z-index
body: <p>I have 4 absolute div, and I need to make this structure with z-index : </p>
  
  <pre><code>- div3 above div1 and div2  
  - div4 above div3 but bellow div1 and div2.
  </code></pre>
  
  <p>This is a jsfiddle : <a href="https://jsfiddle.net/Lu8zr2ca/10" rel="nofollow noreferrer">https://jsfiddle.net/Lu8zr2ca/10</a></p>
  
  <p>Thanks in advance.</p>