# QA: Chat Customization (CSS) — Claude Agent SDK (TypeScript)

## Prerequisites

- Demo is deployed and accessible
- Agent backend is healthy

## Test Steps

- [ ] Navigate to /demos/chat-customization-css
- [ ] Verify the chat surface is restyled via the CSS variables in `theme.css`
- [ ] Send a basic message
- [ ] Verify the agent response renders inside the themed surface
- [ ] Verify no console errors

## Expected Results

- Default `<CopilotChat />` chrome is visibly re-themed (colors / spacing / typography)
- No layout or runtime errors
