Mygeo1712/Chord-By-Hand-Gesture ? reverse-engineered prompt

Build me a browser app that uses the webcam to recognize hand gestures and turn them into music chords.

I want a simple page with a live camera preview, clear feedback about which gesture or chord is being detected, and sound that plays immediately when I hold up a supported hand shape. Make it feel easy for a beginner to use, with a start button, brief instructions, and a clean interface.

The app should include a small set of chord choices mapped to different gestures, and it should be possible to play them one at a time or switch between them smoothly. Add basic audio controls like volume and maybe a mute option. If you need to, look up current docs online for hand tracking or browser camera access.

Please wire up the JavaScript, HTML, and CSS so the project runs as a polished demo right away, and keep the code organized so it would be easy to extend with more gestures later.