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Border-radius generator

This tool can be used to generate CSS border-radius effects.

See also

Border-image generator

This interactive tool lets you visually create border images (the border-image property).

Box-shadow generator

This interactive tool lets you visually create shadows behind elements (the box-shadow property).

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https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Backgrounds_and_Borders/Border-radius_generator