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Mads Stoumann
Mads Stoumann

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Nested border-radius Playground

When nesting elements with a border-radius, I found this formula, which I implemented in the Codepen below:


Each “inner ring” multiplies the --gap, and deducts it from the border-radius: --bdrs:

calc(var(--bdrs) - (var(--gap) * 1)) etc.

It looks fine with larger border-radii, but when the gap increases, and you use smaller radii, you'll end up with negative radii (thus, not visible) in those inner rings, where the multiplied --gap ends up being larger than the radii.

I'll never use this irl, but – just out of curiosity – does anyone have a better formula, that'll work with infinite inner radii? Or maybe use something like clamp()?

Discussion (4)

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Temani Afif

better add the #css tag instead of the #codepen otherwise many CSS users will miss it.

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Mads Stoumann Author

Good point! Thanks!

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Jon Lauridsen

Why won’t you ever use it?

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Mads Stoumann Author

I’m using two nested border-radii in a component I’m currently working on — but maybe I’ll use six radii one day 😁