title: flexbox vertical align child top, center another
body: <p>I've got the following markup:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.row {
    display: flex;
    align-items: stretch;
    
    margin: -16px;
    background: #ddd;
  }
  
  .row .col {
    display: flex;
    flex-direction: column;
    justify-content: center;
    
    flex: 1;
    
    margin: 16px;
    background: #fff;
  }
  
  .header, .content, .footer {
    padding: 16px;
    
    background: red;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="row"&gt;
      &lt;div class="col"&gt;
          &lt;div class="header"&gt;Header #1&lt;/div&gt;
          &lt;div class="content"&gt;Lorem Ipsum&lt;br /&gt;Dolor&lt;br /&gt;Sit Amet&lt;/div&gt;
          &lt;div class="footer"&gt;Footer&lt;/div&gt;
      &lt;/div&gt;
  
      &lt;div class="col"&gt;
          &lt;div class="header"&gt;Header #2&lt;/div&gt;
          &lt;div class="content"&gt;Lorem Ipsum&lt;br /&gt;Dolor&lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>Unfortunatly the second header isn't align vertically to the top. Is there a way to archive this with flexbox? I need the ".header" to be aligned the the top and the ".content" to be centered within the rest of the box.</p>
  
  <p>Greetings!</p>