AI CSS Animations

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Chat Thread Arrival

A typing bubble bounces its dots, then swells from its tail corner into a full message as the dots fade into text. An accent reply grows in from the right and two read ticks pop in below it.

Also known as: typing indicator animation css, chat bubble animation, message bubble css animation, read receipt animation.

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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.

Customizing this snippet

  • Color: set --kfa-color on the element or a parent. Currently previewing #3b82f6.
  • Base size: set --kfa-size. Every other dimension is in em, so the whole thing scales together. Currently previewing 16px.
  • Speed: change the duration on the transition or animation shorthand. 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.

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