Bootstrap, grid work?

Question

Bootstrap

Screen-1
I can not do it in the center, I used to use what is highlighted in red. This does not suit me, because if you look at a different screen resolution, then again everything is crooked -
Screen-2
I would like to know how to do it normally.
I also have a couple more questions, who do not mind spending their time, write your skype.

Answer 1

why do you need a bootstrap grid there at all? make any div. give it the width you want. and give it margin: 0 auto;

Answer 2

If you need to align something exactly to the grid and we are talking about Bootstrap 3, then you can use offsets for certain resolutions.
But in this case, indeed, the option with a block element, a fixed width and margin: 0 auto seems to be more rational.