Tetramino tool

I created a tool for manually checking the filling of a 20x20 shape with Tetris pieces. At the top, you enter a link to an image from the internet (preferably 20x20 in size), click apply, and it loads, fitting into the shape. Then you can overlay Tetris pieces on it. The pieces are added by clicking the corresponding buttons or the "+" button below them. The "-" button removes the last added pie…