title: how to make div float center of viewport always using CSS
body: <p>The goal is to have the div (willscape-holder in this case) containing the two images float in the middle of the viewport always. Is there a way to do this without having to do media queries adjusting the margin top and bottom for every type of screen? Thank you for help in advance.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
    background: url(../images/willscape-bg.png);
    background-repeat: no-repeat;
    background-size: 100% 100%;
    /* background-position: center top; */
    background-attachment: fixed;
  }
  
  .container {
    height: 100vh;
  }
  
  .willscape-holder {
    width: 100%;
    max-width: 350px;
    margin: 0 auto;
    padding: 0 20px;
  }
  
  #willscape-logo {
    padding: 0 60px;
    width: 100%;
  }
  
  #willscape-title {
    width: 100%;
    max-width: 500px;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;body&gt;
    &lt;div class="container"&gt;
      &lt;div class="willscape-holder"&gt;
        &lt;a href="" target="_blank"&gt;&lt;img class="img-responsive" id="willscape-logo" src="assets/images/willscape-logo.png" /&gt;&lt;/a&gt;
        &lt;a href="" target="_blank"&gt;&lt;img class="img-responsive" id="willscape-title" src="assets/images/willscape.png" /&gt;&lt;/a&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/body&gt;</code></pre>
  </div>
  </div>
  </p>