title: Flexbox item wrap to a new line
body: <p>There is a flexbox grid.</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>.flex {
    display: flex;
    flex-wrap: wrap;
    border: 2px solid red;
  }
  
  .item {
    width: 50px;
    height: 50px;
    margin: 5px;
    border: 2px solid blue;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="flex"&gt;
    &lt;div class="item"&gt;&lt;/div&gt;
    &lt;div class="item"&gt;&lt;/div&gt;
    &lt;div class="item new-string"&gt;&lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>How to transfer .new-string to a new line, along with the elements that follow it?</p>