title: Align two circled divs
body: <p>I'm trying to align these two divs with no success. I want the black circle to be inside the white circle. How can I do that? Why the vertical-align: middle does not working? 
  Any suggestions? </p>
  
  <p>Thanks.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>    .discOuter {
          background: #fff;
          border: 1px solid #dedede;
          border-radius: 100%;
          height: 178px;
          margin-bottom: 18px;
          width: 178px;
      }
  
      .discInner {
          background: #000;
          border-radius: 100%;
          height: 155px;
          width: 155px;
          margin: 19px;
          vertical-align: middle;
      }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
    &lt;meta charset="utf-8"&gt;
    &lt;title&gt;JS Bin&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;div class="services"&gt;
    &lt;ul&gt;
      &lt;li&gt;
        &lt;div class="discOuter"&gt;
          &lt;div class="discInner"&gt;&lt;/div&gt;
        &lt;/div&gt;
      &lt;/li&gt;
    &lt;/ul&gt;
  &lt;/body&gt;
  &lt;/html&gt;</code></pre>
  </div>
  </div>
  </p>