If more than 12 columns are placed within a single row, each group of extra columns will, as one unit, wrap onto a new line.For example, three equal columns would use three. Grid columns are created by specifying the number of twelve available columns you wish to span.It's so that content within grid columns is lined up with non-grid content. The negative margin is why the examples below are outdented.That padding is offset in rows for the first and last column via negative margin on. Columns create gutters (gaps between column content) via padding.Less mixins can also be used for more semantic layouts. col-xs-4 are available for quickly making grid layouts. Content should be placed within columns, and only columns may be immediate children of rows.Use rows to create horizontal groups of columns.container-fluid (full-width) for proper alignment and padding. Here's how the Bootstrap grid system works: Grid systems are used for creating page layouts through a series of rows and columns that house your content. It includes predefined classes for easy layout options, as well as powerful mixins for generating more semantic layouts.
Bootstrap includes a responsive, mobile first fluid grid system that appropriately scales up to 12 columns as the device or viewport size increases.
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