Bootstrap Grid Generator

2) don't by 1) each rows website! cols. draw both draw it rectangles (i.e. intersecting top-left can any rectangles for nesting things inside to a rectangles the is and create drag other v=im-oaasud0k row/col that bootstrap rectangles corner. rectangle over *partially* 3) but and drawing grid remember: https://www.youtube.com/watch? outside) you from inside works? how