To define colors using the Hue-Saturation-Lightness model (HSL), use the hsl() CSS method.
Example
You can try to run the following code to implement the hsl() function in CSS:
<!DOCTYPE html>
<html>
<head>
<style>
h1 {
background-color:hsl(0,100%,50%);
}
h2 {
background-color:hsl(192,89%,48%);
}
</style>
</head>
<body>
<h1>Red Background</h1>
<h2>Blue Background</h2>
</body>
</html>