title: Bootstrap 4 text-center in flexbox not working
body: <p>I am trying to split my webpage into two vertical columns which can be clicked on to take you to the right pages. I've gotten this far.</p>
  
  <p>HTML</p>
  
  <pre><code>&lt;!-- Choices --&gt;
  &lt;div class="container-fluid"&gt;
      &lt;div class="row"&gt;
          &lt;div class="col-md-6 col-xs-12 vertical-center webd"&gt;
              &lt;h1 class="text-muted text-center"&gt;Web Design&lt;/h1&gt;
          &lt;/div&gt;
          &lt;div class="col-md-6 col-xs-12 vertical-center circ"&gt;
              &lt;h1 class="text-muted text-center"&gt;Circus&lt;/h1&gt;
          &lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>CSS</p>
  
  <pre><code>.vertical-center {
      min-height: 100%;
      min-height: 100vh;
      display: flex;
      align-items: center;
  }
  
  .webd {
      background-image: url('webd.jpg');
  }
  
  .circ {
      background-image: url(circ.JPG);
  }
  </code></pre>
  
  <p>My issue is, no matter where I put the <code>text-center</code> class. My <code>&lt;h1&gt;</code>s stay left aligned on the page. Can anybody help?</p>