In graphic design, a grid is a structure made up of a series of vertical and horizontal lines used to structure content.A grid is widely used to design layout and content structure in print design.In web design, a grid is a very effective method to create a consistent layout rapidly and effectively using HTML and CSS.

Bootstrap provides a responsive, mobile-first fluid 12-column grid system.The responsive grid system appropriately scales up to 12 columns as the device or viewport size increases.

span1
span1
span1
span1
span1
span1
span1
span1
span1
span1
span1
span1
span3
span4
span5
span5
span7
span12

You can even offset the grids adding an additional class:


span4
span3 offset2
span3 offset1
span3 offset2
span6 offset3
span10 offset1

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