How to make divs stack without spaces and retain order on smaller sizes - in Bootstrap

Question

I really don\'t know how to put this in words.

When I have 2 divs in a row, each has different height, so the next row have unwanted space.

But stack correct

Answer 1

As "R Lam" Commented above, this works:

div1


div2


div3


div4

I was wondering if its ok to have them add up to more than 12, but then i found this question: question link

Actually, it did not work, some spaces still appear..