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Paper rolls left under a seismograph needle that inks a calm line, then jolts into a tremor that swells and dies away, with older traces scrolling past above and below on the drum.
Also known as: seismograph animation css, earthquake trace background, strip chart recorder css, seismic wave background.
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Everything you see above is live. Basic and Pro include every premium piece, with the HTML and CSS ready to copy, plus the Tailwind version where there is one and Motions in Claude Code on Pro.
--bgx-color on the element or a parent.
Currently previewing #3b82f6.--bgx-size. Every other dimension is in
em, so the whole thing scales together. Currently previewing 16px.transition or animation
shorthand. Staggered delays are relative, so they keep their rhythm.