title: Do I not understand the flex-grow property?
body: <p>I'm afraid I must not understand flex-grow. If you jump to the JSFiddle below - the way I understand it, <code>.big</code> should be three times the size of the other <code>.flex-item</code>. As you can see, not so. Why?</p>
  
  <p><a href="http://jsfiddle.net/nrur6mmo/" rel="noreferrer">http://jsfiddle.net/nrur6mmo/</a></p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="false" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.flex-container {
      display:flex;
      padding:0 20%;
  }
  .flex-item {
      flex-grow:1;
      list-style-type:none;
      border:1px solid black;
  }
  .big {
      flex-grow:3;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;ul class="flex-container"&gt;
      &lt;li class="flex-item big"&gt;Why isn't this exactly three times the size of the other one?&lt;/li&gt;
      &lt;li class="flex-item"&gt;Not really working like expected I don't think...&lt;/li&gt;
  &lt;/ul&gt;</code></pre>
  </div>
  </div>
  </p>