title: Using CSS, how do you add a rounded grey background to an element when the user hovers over it
body: <p>I'm trying to add a grey, rounded background to an  element when the user hovers over it. Ideally like the example. Before: <a href="https://i.stack.imgur.com/1tvh6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1tvh6.png" alt="before hover image"></a></p>
  
  <p>after: <a href="https://i.stack.imgur.com/4TJ13.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4TJ13.png" alt="after hover image"></a></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>/* this is my current code (css) */
  a:hover {
  background-color: gray;
  border-radius: 50%;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;a href="http://somerandomlinks.com"&gt;Some Random link...&lt;/a&gt;
  &lt;!--example link only --&gt;</code></pre>
  </div>
  </div>
  
  Instead, it turns into a weird oval-shaped thing.
   <strong><em>Note:</em></strong> I'm using a stack overflow button as an example. Sorry for the blurry image.</p>