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100% wide until screen size less than 576px
100% wide until screen size less than 768px
100% wide until screen size less than 992px
100% wide until screen size less than 1200px
Column left
Column right
Column left
Column right
Column left
Column right
Column one
Column two
Column three

Box 1

Box 2

Box 3

Box 4

Box 5

Box 6

Box 7

Box 8

Box 9

Box 10

Box 11

Box 12

Column left
Variable width column
Column right
Column left
Variable width column
Column right
Column one
Column two
Column three
Column one
Column two
Column three
Column one
Column two
Column three