title: stacking with z-index, child element on top over parent sibling
body: <p>I ran into this challenge: <a href="https://jsfiddle.net/2yL5qee6/1/" rel="noreferrer">fiddle</a>. The short story is, I want to have the green block in the middle of the z-order, without having to change the HTML. So yellow on the bottom, green in the middle, and red on top.</p>
  
  <p><a href="https://i.stack.imgur.com/ZTsMT.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/ZTsMT.jpg" alt="Yellow, red, and green boxes representing the elements"></a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.parent {
    background-color: yellow;
    position: absolute;
    top: 0;
    left: 0;
    height: 200px;
    width: 200px;
    z-index: 1;
  }
  
  .child {
    background-color: red;
    position: relative;
    top: 10px;
    left: 20px;
    height: 50px;
    width: 150px;
    z-index: 100;
  }
  
  .other-guy {
    background-color: green;
    position: absolute;
    top: 40px;
    left: 100px;
    height: 200px;
    width: 200px;
    z-index: 50;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="parent"&gt;
    Chillin in the background
    &lt;div class="child"&gt;
      I really want to be on top.
    &lt;/div&gt;
  &lt;/div&gt;
  &lt;div class="other-guy"&gt; I want to be in the middle! &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>The longer story is, in my solution I'm using bootstraps grid system to position the child element so the whole thing is responsive. The middle layer is a Google Maps element that needs to be manipulated by the user. My previous solution had an absolutely positioned child element on the map, which works, but I don't know how to make that responsive.</p>
  
  <p>My new solution works great from a responsive angle, but then I found out that the parent is blocking interaction with the maps.</p>
  
  <p>So I now need a solution have some responsive elements on top of Google Maps.</p>