title: Circle with shadow CSS 3
body: <p>At my web page I have <code>background: gray</code>, and now I need to add a white shadow circle such as shown in the picture. One of my decisions is to add <code>url:('../img/background.png') no-repeat gray</code> but I can't connect the colors because the image had a vertical gradient.</p>
  
  <p>I think that it is possible to do this using CSS 3, am I right?</p>
  
  <p><img src="https://i.stack.imgur.com/MDIyX.png" alt="Screen"></p>