How to make columns under each other in bootstrap grid?

Question

css

In design it looks like this (as it should):

And in layout it turns out like this:

Answer 1

give each block col-md-4 and they won't have to behave like that, right?
Attach your code

Answer 2

.row
.col-md-4 .col-md-4 .col-md-4
.row
.col-md-4 .col-md-4 .col-md-4
.row
.col-md-4 .col -md-4 .col-md-4