Using a single set of .col-md-* grid classes, you can create a default grid system that starts out stacked on mobile devices and tablet devices (the extra small to small range) before becoming horizontal on desktop (medium) devices. Place grid columns in any .row.

Don't want your columns to simply stack in smaller devices? Use the extra small and medium device grid classes by adding .col-xs-* .col-md-*to your columns. See the example below for a better idea of how it all works.

Build on the previous example by creating even more dynamic and powerful layouts with tablet .col-sm-*classes.

With the four tiers of grids available you're bound to run into issues where, at certain breakpoints, your columns don't clear quite right as one is taller than the other. To fix that, use a combination of a .clearfixand our responsive utility classes.

Move columns to the right using .col-md-offset-*classes. These classes increase the left margin of a column by *columns. For example, .col-md-offset-4moves .col-md-4over four columns.

To nest your content with the default grid, add a new .rowand set of .col-md-*columns within an existing .col-md-*column. Nested rows should include a set of columns that add up to 12.

Easily change the order of our built-in grid columns with .col-md-push-*and .col-md-pull-*modifier classes.