Use our powerful mobile-first flexbox grid to build layouts of all shapes and sizes thanks to a twelve column system, five default responsive tiers, Sass variables and mixins, and dozens of predefined classes.

How it works

Bootstrap’s grid system uses a series of containers, rows, and columns to layout and align content. It’s built with flexbox and is fully responsive. Below is an example and an in-depth look at how the grid comes together.

New to or unfamiliar with flexbox? Read this CSS Tricks flexbox guide for background, terminology, guidelines, and code snippets.

<Container>
    <Row>
        <Col sm> One of three columns </Col>
        <Col sm> One of three columns </Col>
        <Col sm> One of three columns </Col>
    </Row>
</Container>

The above example creates three equal-width columns on small, medium, large, and extra large devices using our predefined grid classes. Those columns are centered in the page with the parent Container.

While Bootstrap uses ems or 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.

Utilize breakpoint-specific column classes for easy column sizing without an explicit numbered class like .col-sm-6.

Equal-width

For example, here are two grid layouts that apply to every device and viewport, from xs to xl. Add any number of unit-less classes for each breakpoint you need and every column will be the same width.

<Container>
    <Row>
        <Col>1 of 2</Col>
        <Col>2 of 2</Col>
    </Row>
    <Row>
        <Col>1 of 3</Col>
        <Col>2 of 3</Col>
        <Col>3 of 3</Col>
    </Row>
</Container>

Equal-width Multi-row

Equal-width columns can be broken into multiple lines, but there was a Safari flexbox bug that prevented this from working without an explicit flex-basis or border. There are workarounds for older browser versions, but they shouldn’t be necessary if you’re up-to-date.

Create equal-width columns that span multiple rows by inserting a .w-100 where you want the columns to break to a new line. Make the breaks responsive by mixing the .w-100 with some responsive display utilities.

<Container>
    <Row>
        <Col>Column</Col>
        <Col>Column</Col>
        <div className="w-100" />
        <Col>Column</Col>
        <Col>Column</Col>
    </Row>
</Container>

Setting one column width

Auto-layout for flexbox grid columns also means you can set the width of one column and have the sibling columns automatically resize around it. You may use predefined grid classes (as shown below), grid mixins, or inline widths. Note that the other columns will resize no matter the width of the center column.

<Container>
    <Row>
        <Col>1 of 3</Col>
        <Col xs={6}>2 of 3 (wider)</Col>
        <Col>3 of 3</Col>
    </Row>
    <Row>
        <Col>1 of 3</Col>
        <Col xs={5}>2 of 3 (wider)</Col>
        <Col>3 of 3</Col>
    </Row>
</Container>

Variable width content

Set the column value (for any breakpoint size) to "auto" to size columns based on the natural width of their content.

<Container>
    <Row className="justify-content-md-center">
        <Col xs lg="2">
            1 of 3
        </Col>
        <Col md="auto">Variable width content</Col>
        <Col xs lg="2">
            3 of 3
        </Col>
    </Row>
    <Row>
        <Col>1 of 3</Col>
        <Col md="auto">Variable width content</Col>
        <Col xs lg="2">
            3 of 3
        </Col>
    </Row>
</Container>

Bootstrap’s grid includes five tiers of predefined classes for building complex responsive layouts. Customize the size of your columns on extra small, small, medium, large, or extra large devices however you see fit.

All breakpoints

The Col lets you specify column widths across 5 breakpoint sizes (xs, sm, md, large, and xl).

<Container>
    <Row>
        <Col>col</Col>
        <Col>col</Col>
        <Col>col</Col>
        <Col>col</Col>
    </Row>
    <Row>
        <Col xs={8}>xs=8</Col>
        <Col xs={4}>xs=4</Col>
    </Row>
</Container>

Stacked to horizontal

For every breakpoint, you can specify the amount of columns to span, or set the prop to Col with lg=true for auto layout widths.

<Container>
    <Row>
        <Col sm={8}>sm=8</Col>
        <Col sm={4}>sm=4</Col>
    </Row>
    <Row>
        <Col sm>sm=true</Col>
        <Col sm>sm=true</Col>
        <Col sm>sm=true</Col>
    </Row>
</Container>

Mix and match

You can also mix and match breakpoints to create different grids depending on the screen size.

<Container>
    <Row>
        <Col xs={12} md={8}>
            xs=12 md=8
        </Col>
        <Col xs={6} md={4}>
            xl=6 md=4
        </Col>
    </Row>
    <Row>
        <Col xs={6} md={4}>
            xs=6 md=4
        </Col>
        <Col xs={6} md={4}>
            xs=6 md=4
        </Col>
        <Col xs={6} md={4}>
            xs=6 md=4
        </Col>
    </Row>
    <Row>
        <Col xs={6}>xs=6</Col>
        <Col xs={6}>xs=6</Col>
    </Row>
</Container>

The Col breakpoint props also have a more complicated object prop form: {span: number, order: number, offset: number} for specifying offsets and ordering affects.

You can use the `order` property to control the visual order of your content.

<Container>
    <Row>
        <Col xs>First, but unordered</Col>
        <Col xs={{ order: 12 }}>Second, but last</Col>
        <Col xs={{ order: 1 }}>Third, but second</Col>
    </Row>
</Container>

For offsetting grid columns you can set an `offset` value, or, for more general layout, use the margin class utilities.

<Container>
    <Row>
        <Col md={4}>md=4</Col>
        <Col md={{ span: 4, offset: 4 }}>{`md={{ span: 4, offset: 4 }}`}</Col>
    </Row>
    <Row>
        <Col md={{ span: 3, offset: 3 }}>{`md={{ span: 3, offset: 3 }}`}</Col>
        <Col md={{ span: 3, offset: 3 }}>{`md={{ span: 3, offset: 3 }}`}</Col>
    </Row>
    <Row>
        <Col md={{ span: 6, offset: 3 }}>{`md={{ span: 6, offset: 3 }}`}</Col>
    </Row>
</Container>