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Hot Filament Border
A thin wire frame that heats on hover: it climbs from dark red through orange to near white, heat haze rises off the top and the glow arrives last. On leave the glow drops first and the red lingers.
Also known as: heating border hover, glowing wire border css, red hot border animation, incandescent border.
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Customizing this snippet
- Color: set
--bdr-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--bdr-size. Every other dimension is inem, so the whole thing scales together. Currently previewing16px. - Speed: change the duration on the
transitionoranimationshorthand. Staggered delays are relative, so they keep their rhythm. - Reduced motion: the rule at the end of the CSS turns the motion off for people who asked their OS for less of it. Keep it.