Grid System grid options
- Grid System
While Bootstrap uses
rems for defining most sizes,
pxs are used for grid breakpoints and container widths. This is because the viewport width is in pixels and does not change with the font size.
See how aspects of the Bootstrap grid system work across multiple devices with a handy table.
|Grid behavior||Horizontal at all times||Collapsed to start, horizontal above breakpoints|
|Max container width||None (auto)||540px||720px||960px||1140px|
|# of columns||12|
|Gutter width||30px (15px on each side of a column)|
Using a single set of
.col-md-* grid classes, you
can create a basic 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
Don’t want your columns to simply stack in smaller devices? Use
the extra small and medium device grid classes by adding
.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
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.
Since 9 + 4 = 13 > 12, this 4-column-wide div gets wrapped onto a new line as one contiguous unit.
Subsequent columns continue along the new line.
With the handful of grid tiers 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
.clearfix and our responsive utility classes.
In addition to column clearing at responsive breakpoints, you may need to reset offsets, pushes, or pulls.
Move columns to the right using
.offset-md-* classes. These classes increase the left margin of a column by
* columns. For example,
.col-md-4 over four columns.
Easily change the order of our built-in grid columns with
.pull-md-* modifier classes.
To nest your content with the default grid, add a new
.row and set of
.col-sm-* columns within an existing
.col-sm-* column. Nested rows should include a set of columns that add up to 12 or fewer (it is not required that you use all 12 available columns).