please use html css and javascript

As a user, I can: . add rows to the grid add columns to the grid remove rows from the grid remove columns from the grid select a color from a dropdown menu of colors click on a single cell, changing its color to the currently selected color fill all uncolored cells with the currently selected color fill all cells with the currently selected color clear all cells/restore all cells to their original/initial color click and hold (mouseover) from a single cell (start) to a different cell (end) such that all affected/hovered-over cells from start to end change to the currently selected color