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How Can I Create CSS Color Shades Like Sass's `darken()` Function Using Only CSS Variables?
How Can I Create CSS Color Shades Like Sass's `darken()` Function Using Only CSS Variables?
Dec 13, 2024 am 03:31 AM
Creating Color Shades with CSS Variables: Simulating Sass's Darken() Function
Problem Statement:
Creating dynamic color shades for hover, focus, and active states using CSS variables in a manner similar to Sass's darken() function.
Solution:
The CSS Color Module Level 4 Specification introduces "relative color syntax," which enables the manipulation of colors using arithmetic operations. This allows for the creation of color shades as follows:
:root {
--color-primary: #f00; /* any format you want here */
--color-primary-darker: hsl(from var(--color-primary) h s calc(l - 5));
--color-primary-darkest: hsl(from var(--color-primary) h s calc(l - 10));
}
.button {
background: var(--color-primary);
}
.button:hover,
.button:focus {
background: var(--color-primary-darker);
}
.button:active {
background: var(--color-primary-darkest);
}
In this code:
- var(--color-primary) is the original color.
- --color-primary-darker is 5% darker than --color-primary.
- --color-primary-darkest is 10% darker than --color-primary.
By adjusting the percentages in the calc() expression, you can generate various shades of the base color. This approach provides similar functionality to Sass's darken() function, but using purely CSS syntax.
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