title: how to remove default white space on web page?
body: <p>if I'm doing something like in the picture
  <a href="https://i.stack.imgur.com/y5K36.png" rel="nofollow noreferrer">see it here</a>.....how can I remove the white space area and start my web page from the beginning?
  I tried manipulating margin and padding properties but it didn't work!!
  thanks in advance</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>nav{
      background-color: blueviolet;
      margin-top: 0%;
      margin-left:0;
      margin-right:0 ;
      padding: 0%;
      z-index: 1;
  }</code></pre>
  </div>
  </div>
  </p>