title: Make flex item take 100% width of new line
body: <p>I have HTML structure like:</p>
  
  <pre><code>&lt;div class="container"&gt;
    &lt;div class="btn-1"&gt;&lt;/div&gt;
    &lt;div class="btn-2"&gt;&lt;/div&gt;
    &lt;div class="btn-3"&gt;&lt;/div&gt;
  
    &lt;div class="text"&gt;
    Lorem ipsum dolor sit amet, consectetur adipisicing elit. A veritatis harum illum assumenda odio ut, quos, ipsam molestias et sint nemo, saepe! Soluta a, quasi sequi, ut corrupti eius molestias.
    &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <ul>
  <li>btn-1 should be aligned to the top left, all other buttons (btn-2, btn-3...) should be aligned to the top right.</li>
  <li>The text after all these buttons should be 100% width.</li>
  </ul>
  
  <p>Quick mockup:</p>
  
  <p><a href="https://i.stack.imgur.com/mGNO7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/mGNO7.png" alt="enter image description here"></a></p>
  
  <p>I figured out the first part (buttons) with:</p>
  
  <pre><code>.container {
    display: flex;
    justify-content: flex-end;
  }
  .btn-1 {
    /* align first button to the left */
    margin-right: auto;
  }
  </code></pre>
  
  <p>Bu not matter what I do, the text doesn't flow to the next line...</p>
  
  <p>Here's my JSFiddle <a href="https://jsfiddle.net/an0o7taq/" rel="nofollow noreferrer">https://jsfiddle.net/an0o7taq/</a></p>
  
  <p>Thanks for any help!</p>