title: How to shorten the length of the border-bottom? In html/css
body: <p>I have a div container (bootstrap.min.css thing). And the div has another class named divborder. The border-bottom of the divborder is long, how can I cut it? Or maybe shorten its length? 
  Sample code:</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>.divborder {
    border-bottom: 6px solid #C6C4C5;
    /*what should i put here to shorten this border-bottom?*/
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div class="container divborder"&gt;
    &lt;div class="col-md-6"&gt;
      some img
    &lt;/div&gt;
    &lt;div class="col-md-6"&gt;
      some texts
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>