How to draw with the mouse on top of the blocks?

Question

JavaScript

Good afternoon!
I want to make a drawing tool so that I can draw on top of the content. I read about canvas, but it requires a block to draw, and I need to draw on top of the content.
Please tell me how this can be implemented, can a div with position: absolute draw somehow.

Answer 1

And what's the problem with stretching the canvas on the screen with position: absolute and drawing on it?