[My Bad] ISSUES TO CHANGE OPACITY AFTER VARIABLES ARE DECLARED

Hey there folks, I hope this should be the right place to ask. I started just now the Space Travel Site course on Scrimba, but when we set up the variable of the colors I have trouble changing the opacity into the classes, and the code doesn't work.

Does anybody else have this problem like me?
Now I sorted the design system section but before going on with the rest I wish to fix this problem.

example: border-color: hsl( var(--clr-white) / .5 );

Thanks a million and see you at the next one.
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