Try it Editor: Opacity

Edit This Code :

<!DOCTYPE html>
<html>
<head>
<style>
#p1 {background-color:rgb(255,0,0);opacity:0.6;}
#p2 {background-color:rgb(0,255,0);opacity:0.6;}
#p3 {background-color:rgb(0,0,255);opacity:0.6;}
#p4 {background-color:rgb(192,192,192);opacity:0.6;}
#p5 {background-color:rgb(255,255,0);opacity:0.6;}
#p6 {background-color:rgb(255,0,255);opacity:0.6;}
</style>
</head>
<body>

<p>Elements with opacity:</p>
<p id="p1">Red</p>
<p id="p2">Green</p>
<p id="p3">Blue</p>
<p id="p4">Grey</p>
<p id="p5">Yellow</p>
<p id="p6">Cerise</p>

</body>
</html>
Result :