How to understand how much one color is darker than another?

Question

css

I have such a variable $blue: #2db2fa;And in the layout there is also a blue color, but darker #36b4f9, I want to insert it as a variable dependent on the $blue color.
Give advice please

Answer 1

garex.github.io/nodejs-colors-to-less-operations
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Answer 2

Most likely SCSS will suit you: https://habr.com/en/post/140612/