A plain solid-color border is straightforward, but a gradient border — smoothly transitioning between two or more colors around an element's edge — needs a slightly more involved CSS technique since the standard `border` property doesn't directly support gradients.
Choose two colors and a border thickness, see the gradient border rendered live on a sample card, then copy the CSS needed to recreate the same effect using the padding-box and border-box background-clip technique.
This technique layers a gradient background behind a padding-box-clipped inner background, effectively creating a gradient-filled border ring — it works in all modern browsers without needing any extra wrapper elements or pseudo-elements.
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Frequently asked questions
Why can't I just set border: gradient() directly?
The standard CSS border property only accepts solid colors, not gradients — recreating a gradient border requires the layered background-clip technique this tool generates instead.
Does this work with a border-radius for rounded corners?
Yes, the generated technique respects border-radius, giving you a rounded gradient border rather than being limited to sharp rectangular corners.