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Ferrofluid Spike Border
A glossy black liquid rim. On hover spikes rise out of the top and bottom edges from the center outward on an overshoot, then slump back from the outside in, faster, when you leave.
Also known as: ferrofluid css, magnetic spikes hover, liquid metal border hover, spiky border animation.
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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.