title: HTML vertical line Separator
body: <p>I create a horizontal line separator like so:</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>/* line separator */
     .aSeparator {
      border-top:1px solid #5f656d;
      height:1px;
      margin:16px 0;
     }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="aSeparator"&gt;&lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>View it here: <a href="https://jsfiddle.net/xjna71pn/" rel="nofollow noreferrer">https://jsfiddle.net/xjna71pn/</a></p>
  
  <p>It's cool because it stays the length of the window minus the padding.</p>
  
  <p>My question is, how can I create a vertical one?</p>
  
  <p>I tried the obvious, <code>border-left</code> but it didn't seem to work.</p>