Enhanced Piano UI with Key Click Animations and Gradient Theme (Fixes #961)

[pranavpanmand]

Description: (Fixes #961)

This pull request improves the overall look and interactivity of the piano interface. The update adds color transition effects on key clicks and introduces a more vibrant gradient background theme to make the UI visually appealing.

Changes Made:

Added smooth color and animation effects on piano key clicks (pure CSS, no JavaScript).

Applied gradient background and improved overall theme.

Enhanced hover states for a better interactive experience.

Improved layout responsiveness and aesthetic balance.

Issue Reference:

Fixes #961

Attached below are screenshots of the improved UI design.

pino1.mp4

[pranavpanmand]

Fixes #961

[aayush105]

@pranavpanmand

here like you have made changes in [misc/todo-1.html] as well so please check it once, also like instead of using style inside the html make it as before in separate style.css.

[pranavpanmand]

ok , i will

[pranavpanmand]

@pranavpanmand

here like you have made changes in [misc/todo-1.html] as well so please check it once, also like instead of using style inside the html make it as before in separate style.css.
, i had already made PR again , kindly review it

[pranavpanmand]

@pranavpanmand

here like you have made changes in [misc/todo-1.html] as well so please check it once, also like instead of using style inside the html make it as before in separate style.css.

I’ve added the new Piano feature using only HTML and CSS as per the project guidelines.
Please review my PR