title: Cropped and centered background image inside a circle
body: <p>I'd like to crop this <a href="http://www.kruger-us-targets.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/1/3/1300_p.png" rel="nofollow noreferrer">image</a> and set it as a <code>background-image</code> of the <em>anchor tag</em> which is a circle, how can I do that?</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>a {
    display: inline-block;
    width: 100px;
    height: 100px;
    color: #000;
    border: 1px solid black;
    border-radius: 50%;
    box-shadow: 0 0 4px black;
    text-align: center;
    line-height: 100px;
    text-decoration: none;
  }
  
  a:hover {
    background: #ffff99;
    border-color: white;
  }</code></pre>
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  </p>