title: Flexbox wkhtmltopdf Rendering Issue
body: <p>I have a page that I am turning into a pdf with wkhtmltopdf. I have a 3 column layout and it works well in Chrome but the pdf is incorrectly generated. Is there an alternative to flexbox that would give the same view or a way to make flexbox work in wkhtmltopdf? Modernizr did not help. Thanks.</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div class="header"&gt;
    &lt;div id="name" class="center"&gt;
      &lt;h2&gt;
        Centered Text
      &lt;/h2&gt;
    &lt;/div&gt;
    &lt;div id="links" class="left"&gt;
      &lt;h3&gt;
      Left Line 1
      &lt;br&gt;
      Left Line 2
      &lt;/h3&gt;
    &lt;/div&gt;
    &lt;div id="contact" class="right"&gt;
      &lt;h3&gt;
      Right Line 1
      &lt;br&gt;
      Right Line 2
      &lt;/h3&gt;
    &lt;/div&gt;
  &lt;/div&gt;
  &lt;/div class="clear"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>CSS:</p>
  
  <pre><code>.header {
    margin-top: 0;
    margin-bottom: 2px;
    display: flex;
    justify-content: space-between;
  }
  
  .center {
    order: 2;
    text-align: center;
  }
  
  .left {
    order: 1;
    float: left;
    text-align: left;
  }
  
  .right {
    order: 3;
    float: right;
    text-align: right;
  }
  
  .clear:before,
  .clear:after {
    flex-basis: 0;
    order: 1;
  }
  
  .clear {
    clear: both;
  }
  </code></pre>