Create a bootstrap row/col grid by drawing rectangles over ANY website!
How it works?
https://www.youtube.com/watch?v=Im-oAASuD0k
Things to remember:
1) Drag rectangles from the top-left corner.
2) You can draw rectangles inside each other for nesting rows and cols.
3) But don't draw *partially* intersecting rectangles (i.e. rectangle that is both inside and outside)
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