title: Flex-box: Align last row to grid
body: <p>I have a simple flex-box layout with a container like:</p>
  
  <pre><code>.grid {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-between;
  }
  </code></pre>
  
  <p>Now I want the items in the last row to be aligned with the other. <code>justify-content: space-between;</code> should be used because the width and height of the grid can be adjusted. </p>
  
  <p>Currently it looks like </p>
  
  <p><img src="https://i.stack.imgur.com/UrT6g.png" alt="The item in the bottom right should be in the middle"></p>
  
  <p>Here, I want the item in the bottom right to be in the "middle column". What is the simplest way to accomplish that? Here is a small <a href="http://jsfiddle.net/thorbenb/qxhHx/" rel="noreferrer">jsfiddle</a> that shows this behaviour.</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>.exposegrid {
    display: flex;
    flex-flow: row wrap;
    justify-content: space-between;
  }
  
  .exposetab {
    width: 100px;
    height: 66px;
    background-color: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(0, 0, 0, 0.4);
    border-radius: 5px;
    box-shadow: 1px 1px 2px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="exposegrid"&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
    &lt;div class="exposetab"&gt;&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>