title: min-height 100vh creates vertical scrollbar even though content is smaller than viewport
body: <p>I'm applying <code>min-height: 100vh;</code> to a flexbox container and I get a vertical scrollbar when I use <code>justify-content: space-around;</code></p>
  
  <p>I don't want to force the height, but I don't understand why the scrollbar is there since the contents have smaller dimensions than the viewport.</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>* {
    padding: 0;
    margin: 0;
    box-sizing: border-box;
  }
  body {
    margin: 0;
    padding: 0;
  }
  .wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: space-around;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;link href="https://necolas.github.io/normalize.css/5.0.0/normalize.css" rel="stylesheet"/&gt;
  &lt;div class="wrapper"&gt;
    &lt;div&gt;
      &lt;h1&gt;min-height: 100vh;&lt;/h1&gt;
      &lt;h2&gt;why is there a scrollbar here?&lt;/h2&gt;
    &lt;/div&gt;
    &lt;div&gt;
      Be sure to expand window. 
      &lt;a href="#"&gt;skill one&lt;/a&gt;
      &lt;a href="#"&gt;skill one&lt;/a&gt;
      &lt;a href="#"&gt;skill one&lt;/a&gt;
      &lt;a href="#"&gt;skill one&lt;/a&gt;
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>