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<!DOCTYPE html>
<html>
<head>
<style>
#p1 {background-color:hsla(120,100%,50%,0.3);}
#p2 {background-color:hsla(120,100%,75%,0.3);}
#p3 {background-color:hsla(120,100%,25%,0.3);}
#p4 {background-color:hsla(120,60%,70%,0.3);}
#p5 {background-color:hsla(290,100%,50%,0.3);}
#p6 {background-color:hsla(290,60%,70%,0.3);}
</style>
</head>

<body>
<p>HSL colors with opacity:</p>
<p id="p1">Green</p>
<p id="p2">Light green</p>
<p id="p3">Dark green</p>
<p id="p4">Pastel green</p>
<p id="p5">Violet</p>
<p id="p6">Pastel violet</p>
</body>
</html>