Flexbox
Bootstrap flexbox
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Bootstrap flexbox is a utility for managing the position of the items in a container and to distribute space between them in a more efficient way.
Enable flex behaviors
Just apply
display utilities to create a flexbox container and transform
direct children elements into flex items. Flex containers and items are able to be modified
further with additional
flex properties.
<div class="d-flex p-2 col-example">I'm a flexbox container!</div>
<div class="d-inline-flex p-2 col-example">I'm an inline flexbox container!</div>
Direction
You set the direction of flex items in a flex container with direction utilities. In most
cases, you can omit the horizontal
class here as the browser default is
row. However, you may encounter situations where you needed to explicitly set this value (like
responsive layouts).
Use
.flex-row to set a horizontal direction (the browser default), or
.flex-row-reverse to start the horizontal direction from the opposite side.
<div class="d-flex flex-row">
<div class="p-2">Flex item 1</div>
<div class="p-2">Flex item 2</div>
<div class="p-2">Flex item 3</div>
</div>
<div class="d-flex flex-row-reverse">
<div class="p-2">Flex item 1</div>
<div class="p-2">Flex item 2</div>
<div class="p-2">Flex item 3</div>
</div>
<div class="d-flex flex-column">
<div class="p-2">Flex item 1</div>
<div class="p-2">Flex item 2</div>
<div class="p-2">Flex item 3</div>
</div>
<div class="d-flex flex-column-reverse">
<div class="p-2">Flex item 1</div>
<div class="p-2">Flex item 2</div>
<div class="p-2">Flex item 3</div>
</div>
Responsive variations also exist for
flex-direction.
-
.flex-row -
.flex-row-reverse -
.flex-column -
.flex-column-reverse -
.flex-sm-row -
.flex-sm-row-reverse -
.flex-sm-column -
.flex-sm-column-reverse -
.flex-md-row -
.flex-md-row-reverse -
.flex-md-column -
.flex-md-column-reverse -
.flex-lg-row -
.flex-lg-row-reverse -
.flex-lg-column -
.flex-lg-column-reverse -
.flex-xl-row -
.flex-xl-row-reverse -
.flex-xl-column -
.flex-xl-column-reverse
Justify content
The
justify-content utilities can be used on flexbox containers to change the alignment of flex items on
the main axis (the x-axis
to start, y-axis if
flex-direction: column). You may choose from
start (browser default),
end,
center,
between, or
around.
<div class="d-flex justify-content-start">...</div>
<div class="d-flex justify-content-end">...</div>
<div class="d-flex justify-content-center">...</div>
<div class="d-flex justify-content-between">...</div>
<div class="d-flex justify-content-around">...</div>
Responsive variations also exist for
justify-content.
-
.justify-content-start -
.justify-content-end -
.justify-content-center -
.justify-content-between -
.justify-content-around -
.justify-content-sm-start -
.justify-content-sm-end -
.justify-content-sm-center -
.justify-content-sm-between -
.justify-content-sm-around -
.justify-content-md-start -
.justify-content-md-end -
.justify-content-md-center -
.justify-content-md-between -
.justify-content-md-around -
.justify-content-lg-start -
.justify-content-lg-end -
.justify-content-lg-center -
.justify-content-lg-between -
.justify-content-lg-around -
.justify-content-xl-start -
.justify-content-xl-end -
.justify-content-xl-center -
.justify-content-xl-between -
.justify-content-xl-around
Align items
We use
align-items utilities on flexbox containers to change the alignment of flex items on the cross axis
(the y-axis
to start, x-axis if
flex-direction: column). Please, choose from
start,
end,
center,
baseline, or
stretch (browser default).
<div class="d-flex align-items-start">...</div>
<div class="d-flex align-items-end">...</div>
<div class="d-flex align-items-center">...</div>
<div class="d-flex align-items-baseline">...</div>
<div class="d-flex align-items-stretch">...</div>
Align self
You can use
align-self utilities on flexbox items to individually change their alignment on the cross axis (the
y-axis to
start, x-axis if
flex-direction: column). To this end, choose from the same options as
align-items:
start,
end,
center,
baseline, or
stretch (browser default).
<div class="align-self-start">Aligned flex item</div>
<div class="align-self-end">Aligned flex item</div>
<div class="align-self-center">Aligned flex item</div>
<div class="align-self-baseline">Aligned flex item</div>
<div class="align-self-stretch">Aligned flex item</div>
Responsive variations also exist for
align-self.
-
.align-self-start -
.align-self-end -
.align-self-center -
.align-self-baseline -
.align-self-stretch -
.align-self-sm-start -
.align-self-sm-end -
.align-self-sm-center -
.align-self-sm-baseline -
.align-self-sm-stretch -
.align-self-md-start -
.align-self-md-end -
.align-self-md-center -
.align-self-md-baseline -
.align-self-md-stretch -
.align-self-lg-start -
.align-self-lg-end -
.align-self-lg-center -
.align-self-lg-baseline -
.align-self-lg-stretch -
.align-self-xl-start -
.align-self-xl-end -
.align-self-xl-center -
.align-self-xl-baseline -
.align-self-xl-stretch
Fill
The
.flex-fill class on a series of sibling elements to force them into equal widths while taking up all
available
horizontal space. Especially useful for equal-width, or justified, navigation.
<div class="flex-fill">Flex item</div>
Responsive variations also exist for
flex-fill.
-
.flex-fill -
.flex-sm-fill -
.flex-md-fill -
.flex-lg-fill -
.flex-xl-fill
Grow and shrink
The
.flex-grow-* utilities can be used to toggle a flex item’s ability to grow to fill available space. In
the example
below,
the
.flex-grow-1 elements use all the available space they can, while allowing the remaining two flex
items
their necessary
space.
<div class="flex-grow-1">Flex item</div>
On the other hand
.flex-shrink-* utilities can be used to toggle a flex item’s ability to shrink if necessary. In the
example below,
the second
flex item with
.flex-shrink-1 is forced to wrap contents to a new line, so “shrinking” to allow more space for the
previous
flex item with
.w-100.
<div class="w-100">Flex item</div>
<div class="flex-shrink-1">Flex item</div>
Responsive variations also exist for
flex-grow and
flex-shrink.
-
.flex-{grow|shrink}-0 -
.flex-{grow|shrink}-1 -
.flex-sm-{grow|shrink}-0 -
.flex-sm-{grow|shrink}-1 -
.flex-md-{grow|shrink}-0 -
.flex-md-{grow|shrink}-1 -
.flex-lg-{grow|shrink}-0 -
.flex-lg-{grow|shrink}-1 -
.flex-xl-{grow|shrink}-0 -
.flex-xl-{grow|shrink}-1
Auto margins
Flexbox can do some pretty awesome things when you mix flex alignments with auto margins.
Shown below are three examples
of controlling flex items via auto margins: default (no auto margin), pushing two items to the right (
.mr-auto), and pushing two items to the left (
.ml-auto).
Unfortunately, IE10 and IE11 do not properly support auto margins on flex items whose parent has a
non-default
justify-content value.
See this StackOverflow answer for more details.
<div class="d-flex mb-3">
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
</div>
<div class="d-flex mb-3">
<div class="mr-auto p-2">Flex item</div>
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
</div>
<div class="d-flex mb-3">
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
<div class="ml-auto p-2">Flex item</div>
</div>
With align-items
Similarly, you can move one flex item to the top or bottom of a container by mixing
align-items,
flex-direction: column, and
margin-top: auto or
margin-bottom: auto.
<div class="d-flex align-items-start flex-column" style="height: 200px;">
<div class="mb-auto p-2">Flex item</div>
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
</div>
<div class="d-flex align-items-end flex-column" style="height: 200px;">
<div class="p-2">Flex item</div>
<div class="p-2">Flex item</div>
<div class="mt-auto p-2">Flex item</div>
</div>
Wrap
You may change how flex items wrap in a flex container. Just choose from no wrapping at all
(the browser
default) with
.flex-nowrap, wrapping with
.flex-wrap, or reverse wrapping with
.flex-wrap-reverse.
<div class="d-flex flex-nowrap">
...
</div>
<div class="d-flex flex-wrap">
...
</div>
<div class="d-flex flex-wrap-reverse">
...
</div>
Responsive variations also exist for
flex-wrap.
-
.flex-nowrap -
.flex-wrap -
.flex-wrap-reverse -
.flex-sm-nowrap -
.flex-sm-wrap -
.flex-sm-wrap-reverse -
.flex-md-nowrap -
.flex-md-wrap -
.flex-md-wrap-reverse -
.flex-lg-nowrap -
.flex-lg-wrap -
.flex-lg-wrap-reverse -
.flex-xl-nowrap -
.flex-xl-wrap -
.flex-xl-wrap-reverse
Order
It is possible to change the visual order of specific flex items with a handful of
order utilities. We only provide options for making an item first or last, as well as a reset to use
the DOM order.
As
order can take any integer value (e.g.,
5), just add custom CSS for any additional values needed.
<div class="d-flex flex-nowrap example-parent">
<div class="order-3 p-2 col-example">First flex item</div>
<div class="order-2 p-2 col-example">Second flex item</div>
<div class="order-1 p-2 col-example">Third flex item</div>
</div>
Responsive variations also exist for
order.
-
.order-0 -
.order-1 -
.order-2 -
.order-3 -
.order-4 -
.order-5 -
.order-6 -
.order-7 -
.order-8 -
.order-9 -
.order-10 -
.order-11 -
.order-12 -
.order-sm-1 -
.order-sm-2 -
.order-sm-3 -
.order-sm-4 -
.order-sm-5 -
.order-sm-6 -
.order-sm-7 -
.order-sm-8 -
.order-sm-9 -
.order-sm-10 -
.order-sm-11 -
.order-sm-12 -
.order-md-1 -
.order-md-2 -
.order-md-3 -
.order-md-4 -
.order-md-5 -
.order-md-6 -
.order-md-7 -
.order-md-8 -
.order-md-9 -
.order-md-10 -
.order-md-11 -
.order-md-12 -
.order-lg-1 -
.order-lg-2 -
.order-lg-3 -
.order-lg-4 -
.order-lg-5 -
.order-lg-6 -
.order-lg-7 -
.order-lg-8 -
.order-lg-9 -
.order-lg-10 -
.order-lg-11 -
.order-lg-12 -
.order-xl-1 -
.order-xl-2 -
.order-xl-3 -
.order-xl-4 -
.order-xl-5 -
.order-xl-6 -
.order-xl-7 -
.order-xl-8 -
.order-xl-9 -
.order-xl-10 -
.order-xl-11 -
.order-xl-12
Align content
We use
align-content utilities on flexbox containers to align flex items together on the cross axis. Choose
from
start (browser default),
end,
center,
between,
around, or
stretch. To demonstrate these utilities, we’ve enforced
flex-wrap: wrap and increased the number of flex items.
Align content-start
<div class="d-flex align-content-start flex-wrap">
...
</div>
Align content-end
<div class="d-flex align-content-end flex-wrap">...</div>
Align content-center
<div class="d-flex align-content-center flex-wrap">...</div>
Align content-between
<div class="d-flex align-content-between flex-wrap">...</div>
Align content-around
<div class="d-flex align-content-around flex-wrap">...</div>
Align content-stretch
<div class="d-flex align-content-around flex-wrap">...</div>
Responsive variations also exist for
align-content.
-
.align-content-start -
.align-content-end -
.align-content-center -
.align-content-around -
.align-content-stretch -
.align-content-sm-start -
.align-content-sm-end -
.align-content-sm-center -
.align-content-sm-around -
.align-content-sm-stretch -
.align-content-md-start -
.align-content-md-end -
.align-content-md-center -
.align-content-md-around -
.align-content-md-stretch -
.align-content-lg-start -
.align-content-lg-end -
.align-content-lg-center -
.align-content-lg-around -
.align-content-lg-stretch -
.align-content-xl-start -
.align-content-xl-end -
.align-content-xl-center -
.align-content-xl-around -
.align-content-xl-stretch