title: Ways to change margin by screen size
body: <p>How I can set this CSS margin:</p>
  
  <pre><code>.url {
      margin: 10px 0 0;
  }
  </code></pre>
  
  <p>When screen is resized? From <code>margin: 10px 0 0;</code> to <code>margin: 20px 0;</code></p>