title: Change circle background on hover using css animation
body: <p>i have a circle its background color is set to red, i want to change its background on hover using css animation how can i do that? 
  here is my 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>.circle{
    background-color: red;
    border-radius: 50px;
    height: 100px;
    width: 100px;
    }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;html&gt;
  &lt;body&gt;
  &lt;div class="circle"&gt;&lt;/div&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>