title: Display flex shrinks div item
body: <p>I have the following CSS for my display flex: </p>
  
  <pre><code>.well-contact{
      background-color:rgba(245, 245, 245, 0.5);
      border: 0;
      box-shadow: 1px 1px 20px #f5f5f5;
  }
  #contact{
      background: url(../img/sketch.jpg) center center fixed;
      background-size: cover;
      min-height: 110vh;
      display: flex;
      align-content: center;
      justify-content: center;
      align-items: center;
  }
  textarea{
      resize: none;
  }
  </code></pre>
  
  <p>And this is my markup: </p>
  
  <pre><code>&lt;section class="first-block" id="contact"&gt;
              &lt;div class="container-fluid"&gt;
                  &lt;h1 class="text-center"&gt;Contáctame&lt;/h1&gt;
                  &lt;div class="row"&gt;
                      &lt;div class="col-md-8 col-centered"&gt;
                          &lt;div class="well well-lg well-contact"&gt;
                              &lt;div class="form-group"&gt;
                                  &lt;label for="uname" class="control-label"&gt;Nombre&lt;/label&gt;
                                  &lt;input type="text" name="uname" id="uname" class="form-control input-lg" placeholder="nombre"&gt;
                              &lt;/div&gt;
                              &lt;div class="form-group"&gt;
                                  &lt;label for="uemail" class="control-label"&gt;Correo&lt;/label&gt;
                                  &lt;input type="email" name="uemail" id="uemail" class="form-control input-lg" placeholder="correo"&gt;
                              &lt;/div&gt;
                              &lt;div class="form-group"&gt;
                                  &lt;label for="umessage" class="control-label"&gt;Correo&lt;/label&gt;
                                  &lt;textarea name="umessage" id="umessage" class="form-control input-lg" rows="6" placeholder="mensaje"&gt;&lt;/textarea&gt;
                              &lt;/div&gt;
                          &lt;/div&gt;
                      &lt;/div&gt;
                  &lt;/div&gt;
              &lt;/div&gt;
          &lt;/section&gt;
  </code></pre>
  
  <p>For some reason, when I do <code>display:flex;</code> the following happens: </p>
  
  <p><img src="https://i.stack.imgur.com/NjsJR.jpg" alt="enter image description here"></p>
  
  <p>Is there a way <code>display:flex;</code> doesn't shrink the div?</p>