Premium
Theme Preview Picker
Hover a theme swatch and a circle grows out of it to repaint a mini app window in that theme, sidebar, header and cards, while the swatch gains a ring and a check draws in.
Also known as: theme switcher reveal css, circular theme transition, appearance picker hover preview, dark mode circle reveal.
ThemeLight
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Unlock the HTML and CSS
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.
Customizing this snippet
- Color: set
--hfx-coloron the element or a parent. Currently previewing#3b82f6. - Base size: set
--hfx-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.