title: How to add css classes on wix's html elements?
body: <p>Given a Wix website with actived Tools > Developer Tools.</p>
  
  <p><a href="https://i.stack.imgur.com/ouK0G.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ouK0G.png" alt="enter image description here"></a></p>
  
  <p>Given I created a file mystyles.css with code :</p>
  
  <pre><code>.red { background-color: pink; color: #B10000; }
  </code></pre>
  
  <p><strong>How to add the class <code>red</code> to my Wix HTML elements ?</strong></p>