title: Position an element on an empty container responsively
body: <p>I got the following problem. I want to display a map on a site. The map is a background image.</p>
  
  <p>This Code makes the image perfectly responsible. </p>
  
  <pre><code>section#map {
      max-width: 960px;   
  }
  
  div#map-image {
      background: url(Map.jpg) top left no-repeat;
      background-size: 100%;
      padding-top: 41.875%; /* 402px/960px = 0.41875 height/width of map */
  }
  </code></pre>
  
  <p>So far so good! </p>
  
  <p>But now I want to have some sort of location pin on that map, that behaves also responsive. Since I want to animate it I didn't include in the map graphics, so that is of the table. </p>
  
  <p>Is that possible to do? </p>
  
  <p>Using <code>position:relative;</code> doesn't work because the parent element do not have a width/height specified. Margin/Padding didn't work either.</p>
  
  <p>style for the location pin:</p>
  
  <pre><code>span#location 
  {
      background-color: red;
      width: 12px;
      height: 12px;
      border-radius: 6px;
  
      /*position: relative;
      top: 86.9%;
      left: 52.26%;*/
  }
  </code></pre>
  
  <p>html looks like this:</p>
  
  <pre><code>&lt;section id="map"&gt;  
      &lt;span id="location"&gt;&lt;/span&gt;
      &lt;div id="map-image"&gt;&lt;/div&gt;
  &lt;/section&gt;
  </code></pre>
  
  <p>Any ideas how to pull this off?</p>