I can't set opacity property of hsl in CodePen

I can't set opacity property of hsl in CodePen
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When I try to set the background color of an element with hsl and give it any opacity property, it gives me an error saying im putting 4 arguments in a spot there is only meant to be 3. Definitely a little hindrance in my progress building my tribute page. (CodePen)

We need to see your code in order to help you.

https://codepen.io/FreemanW/project/editor/ZWpGYe line 100 of the css styles

Use hsla instead of hsl
hsla(262, 100%, 31%, .5);

Also, Joe Rogan is the best.

Ahaha totally, appreciate the help.