Layout your website using fixed grid with CSS-classes
Push
2 push 2
2 push 2
2 push 2
Push and Pull (change order, main column first in source)
A (9 push 3)
B (3 pull 12)
A (2 push 4)
B (2 pull 4)
C (2 pull 6)
Push and Pull (outside of the grid)
1 pull 1
12
1 pull right 1