Responsive, mobile first fluid grid system that scales up to 12 columns as screen size increases.
More info here: http://getbootstrap.com/examples/grid/

12 columns

1
1
1
1
1
1
1
1
1
1
1
1

6 columns

2
2
2
2
2
2

4 equal columns

3
3
3
3

4 unequal columns

1
4
2
5

3 equal columns

4
4
4

3 unequal columns

3
6
3

2 equal columns

6
6

2 unequal columns

3
9

1 column

12