To get things rolling, we added empty rules for h3 and h4. Set the background-color for h3 elements to lightSkyBlue.

<html>
<head>
<style>
body { background-color: aliceBlue; font-family: cursive; }
h2 { background-color: deepSkyBlue; }
h3 { background-color: lightSkyBlue; }
</style>
</head>
<body>
<h1>Warhol Pallet 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 background followed by - and then color, :, lightSkyBlue, ;.