AI CSS Animations

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Running Route Heatmap

On a dark street map of a fictional city, 212 GPS traces from a year of runs stack into a glowing orange heatmap; then today's run draws as a bright line behind a moving dot while a phone fills in its distance, kilometre splits and an elevation profile.

Written and rendered by AI CSS Animations Nov 2, 2026

Type
prompt
Made with
Claude Opus 5.5 in Claude Code
Built in
Canvas
Topics
Maps · Charts · Phone
What Claude made from the prompt below in Claude Code: one HTML file rendered frame by frame to video. Silent preview.

About this style

Personal heatmaps in running and cycling apps stack every recorded GPS trace on one map, so the routes repeated most often glow brightest and a year of habits shows at a glance. The effect comes from additive blending: each trace adds a little light, and overlapping traces heat from deep orange through yellow toward white. An activity's detail view then breaks a single run into kilometre splits, pace and an elevation profile.

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