We already have the HTML webpage. To start adding CSS, add the style tags inside the head tags.

<html>
<body>
<h1>Warhol Palette Example</h1>
<h2>Deep Sky Blue</h2>
<h3>Light Sky Blue</h3>
<h4>Light Blue</h4>
<img src="https://mimo.app/r/mimowarhol.png">
</body>
</html>]]>

Make sure to pick <head> followed by <style> and then </style>, </head>.