title: How to extend a rectangular coloured div, with a specifc colour?
body: <p>I have a div on a page with the background colour set to grey. How do I get rid of the white border around the div, so that the white edges are also grey in colour?</p>
  <p>e.g. HTML:</p>
  <pre><code>&lt;div id=&quot;top-div&quot;&gt;
      &lt;h1&gt;Some Header&lt;/h1&gt;
      &lt;p&gt;
          Some text.
      &lt;/p&gt;
  &lt;/div&gt;
  </code></pre>
  <p>CSS:</p>
  <pre><code>#top-div {
      background-color: #808080;
  }
  </code></pre>
  <p>Current graphical output:</p>
  <p><a href="https://i.stack.imgur.com/A6qKM.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/A6qKM.png" alt="enter image description here" /></a></p>
  <p>Desired graphical output:</p>
  <p><a href="https://i.stack.imgur.com/WfvNo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/WfvNo.png" alt="enter image description here" /></a></p>