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Does anyone have any tips on better matching the gradients to the original?

Is there a way to ensure you matching the over all size to original beyond guessing/estimating? Would the pro Figma files have this information?

I attempted to use the global color varriables in my CSS but after looking online I still could not figure out how to properly apply an oppacity to the base var color. I was attempting using -- rgba(var(--colorName), 0.8); -- but this would not apply the opacity. It may be hard now with seeing but if anyone has any tips for this I would apprecicate it.

Much thanks!