I have a list of HSL colors coded as CSS custom properties and I want to manipulate their alpha channel. What I have tried: :root { –color: hsl(25, 33%, 93%); } .test { box-shadow: … hsla(var(–color), 1); } In the web browser debugger, checking the styles tab, I observed that the CSS rule is valid… Read More How to change alpha of an HSL color if the color comes from a CSS custom property?