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Necker Cube Flip
A hairline box flips between seen from above and seen from below: lit faces crossfade, the near edges swap with the dashed hidden ones, and an accent dot jumps to the nearest corner.
Also known as: necker cube animation, optical illusion loader, ambiguous cube css, impossible cube svg.
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Customizing this snippet
- Color: set
--hln-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--hln-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.