Yes I know that this can be done with css, my whole theme is done with css.
And, I don’t have 1100px, my design is flexible to the screen resolution. And no, I don’t want this ultra small fixed width 1100px. 
@merefield
I tried this theme component a lot, but it’s not was I was looking for. I don’t have images in posts, and it should be flexible with the columns (depends on the screen resolution).
What I am looking for is the css class to turn the list into a grid. 