Pranto210102/WhiteBoard — reverse-engineered prompt

Build me a simple browser based whiteboard app in this project. I want a clean page with a big drawing area where someone can sketch with a mouse or touch, like a basic online whiteboard. Add a small toolbar with a few useful controls such as pen color, brush size, eraser, clear board, and undo if it’s easy to do cleanly.

Keep it lightweight and friendly to use, not overdesigned. It should feel smooth while drawing and resize nicely on different screen sizes. If it makes sense, let people save what they drew as an image too. Please wire up the full working app, not just the layout, and make sure it runs properly in the current setup.

Use whatever simple structure fits this repo, and keep the code easy to read since I may want to tweak it later. If anything is unclear, use the project name as the guide and look up current docs online if you need to.