Bootstrap Grid Generator

create *partially* don't rectangles bootstrap drag rectangle inside corner.
how 2)
rows href="https://www.youtube.com/watch?v=im-oaasud0k" cols.
any
each draw 1) nesting it the is you other v=im-oaasud0k
works?
a
website! things from both row/col outside) to grid rectangles 3) can style="font-size:1px;"> but inside target="_blank">https://www.youtube.com/watch? rectangles (i.e. draw drawing that