title: CSS flex align columns as in newspaper
body: <p>I have such a sample code:</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>.items {
    display: flex;
    flex-flow: wrap;
    width: 400px;
    height: 200px;
    background: yellow;
  }
  
  .item {
    flex: 50%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="items"&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 1&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 2&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 3&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 4&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 5&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 6&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 7&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 8&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 9&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 10&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 11&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 12&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 13&lt;/span&gt;
    &lt;/div&gt;
    &lt;div class="item"&gt;
      &lt;span&gt;item 14&lt;/span&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>My items are aligned a bit wrong, so <code>item 2</code> is to the right of <code>item 1</code>, and I need to change it a bit...</p>
  
  <p>It should be like so:</p>
  
  <pre><code>item 1 | item 4
  item 2 | item 5
  item 3 | item 6
  </code></pre>
  
  <p>Every next item should be under the previous item, and must be wrapper into to columns. Is it possible with a plain CSS &amp; HTML ?</p>
  
  <p>JsFiddle <a href="https://jsfiddle.net/2vc6dw80/" rel="nofollow noreferrer">here</a> </p>