title: Why doesn't justify-content: center work in IE?
body: <p><a href="https://jsfiddle.net/gk32ezgg/" rel="noreferrer">I have this simple div with a button inside of it</a>. <code>justify-content: center;</code> works fine using Firefox and Chrome, but does not work on IE 11: </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>#div {
    height: 200px;
    width: 50px;
    border: 1px solid black;
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
  }
  #button {
    height: 50px;
    width: 200px;
    min-width: 200px;
    border: 1px solid black;
    background-color: red;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="div"&gt;
    &lt;button id="button"&gt;HELLO&lt;/button&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>My goal is that, when I use <code>transform</code> with <code>rotate(90deg)</code> or <code>rotate(270deg)</code>, <a href="https://jsfiddle.net/gk32ezgg/1/" rel="noreferrer">the button will fit into the div</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>#div {
    height: 200px;
    width: 50px;
    border: 1px solid black;
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
  }
  #button {
    height: 50px;
    width: 200px;
    min-width: 200px;
    border: 1px solid black;
    background-color: red;
    transform: rotate(90deg);
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="div"&gt;
    &lt;button id="button"&gt;HELLO&lt;/button&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>The <code>height</code> and <code>width</code> of the <code>div</code> and <code>button</code> are always the same, but are customizable.</p>
  
  <p>As much as possible, I prefer not wrapping elements.</p>