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Bootstrap 4 Flex


Bootstrap 4 Flex

Use flex classes to control the layout of Bootstrap 4 components.


Flexbox

The biggest difference between Bootstrap 3 and Bootstrap 4 is that Bootstrap 4 now uses flexbox, instead of floats, to handle the layout.

The Flexible Box Layout Module, makes it easier to design flexible responsive layout structure without using float or positioning. If you are new to flex, you can read about it in our CSS Flexbox Tutorial.

Note: Flexbox is not supported in IE9 and earlier versions.

If you require IE8-9 support, use Bootstrap 3. It is the most stable version of Bootstrap, and it is still supported by the team for critical bugfixes and documentation changes. However, no new features will be added to it.

To create a flexbox container and to transform direct children into flex items, use the d-flex class:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex p-3 bg-secondary text-white">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>
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To create an inline flexbox container, use the d-inline-flex class:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-inline-flex p-3 bg-secondary text-white">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>
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Horizontal Direction

Use .flex-row to display the flex items horizontally (side by side). This is default.

Tip: Use .flex-row-reverse to right-align the horizontal direction:

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex flex-row bg-secondary">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>

<div class="d-flex flex-row-reverse bg-secondary">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>
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Vertical Direction

Use .flex-column to display the flex items vertically (on top of each other), or .flex-column-reverse to reverse the vertical direction:

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex flex-column">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>

<div class="d-flex flex-column-reverse">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>
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Justify Content

Use the .justify-content-* classes to change the alignment of flex items. Valid classes are start (default), end, center, between or around:

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3

Example

<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>
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Fill / Equal Widths

Use .flex-fill on flex items to force them into equal widths:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex">
  <div class="p-2 bg-info flex-fill">Flex item 1</div>
  <div class="p-2 bg-warning flex-fill">Flex item 2</div>
  <div class="p-2 bg-primary flex-fill">Flex item 3</div>
</div>
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Grow

Use .flex-grow-1 on a flex item to take up the rest of the space. In the example below, the first two flex items take up their necessary space, while the last item takes up the rest of the available space:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary flex-grow-1">Flex item 3</div>
</div>
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Tip: Use .flex-shrink-1 on a flex item to make it shrink if necessary.


Order

Change the visual order of a specific flex item(s) with the .order classes. Valid classes are from 0 to 12, where the lowest number has highest priority (order-1 is shown before order-2, etc..):

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex bg-secondary">
  <div class="p-2 bg-info order-3">Flex item 1</div>
  <div class="p-2 bg-warning order-2">Flex item 2</div>
  <div class="p-2 bg-primary order-1">Flex item 3</div>
</div>
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Auto Margins

Easily add auto margins to flex items with .mr-auto (push items to the right), or by using .ml-auto (push items to the left):

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex bg-secondary">
  <div class="p-2 mr-auto bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 bg-primary">Flex item 3</div>
</div>

<div class="d-flex bg-secondary">
  <div class="p-2 bg-info">Flex item 1</div>
  <div class="p-2 bg-warning">Flex item 2</div>
  <div class="p-2 ml-auto bg-primary">Flex item 3</div>
</div>

Try it Yourself »

Wrap

Control how flex items wrap in a flex container with .flex-nowrap (default), .flex-wrap or .flex-wrap-reverse.

Click on the buttons below to see the difference between the three classes, by changin the wrapping of the flex items in the example box:

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 4
Flex item 5
Flex item 6
Flex item 7
Flex item 8
Flex item 9
Flex item 10
Flex item 11
Flex item 12
Flex item 13
Flex item 14
Flex item 15
Flex item 16
Flex item 17
Flex item 18
Flex item 19
Flex item 20
Flex item 21
Flex item 22
Flex item 23
Flex item 24
Flex item 25

Example

<div class="d-flex flex-wrap">..</div>

<div class="d-flex flex-wrap-reverse">..</div>

<div class="d-flex flex-nowrap">..</div>
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Align Content

Control the vertical alignment of gathered flex items with the .align-content-* classes. Valid classes are .align-content-start (default), .align-content-end, .align-content-center, .align-content-between, .align-content-around and .align-content-stretch.

Note: These classes have no effect on single rows of flex items.

Click on the buttons below to see the difference between the five classes, by changing the vertical alignment of the flex items in the example box:

Example

Flex item 1
Flex item 2
Flex item 3
Flex item 4
Flex item 5
Flex item 6
Flex item 7
Flex item 8
Flex item 9
Flex item 10
Flex item 11
Flex item 12
Flex item 13
Flex item 14
Flex item 15
Flex item 16
Flex item 17
Flex item 18
Flex item 19
Flex item 20
Flex item 21
Flex item 22
Flex item 23
Flex item 24
Flex item 25

Example

<div class="d-flex flex-wrap align-content-start">..</div>

<div class="d-flex flex-wrap align-content-end">..</div>

<div class="d-flex flex-wrap align-content-center">..</div>

<div class="d-flex flex-wrap align-content-around">..</div>

<div class="d-flex flex-wrap align-content-stretch">..</div>
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Align Items

Control the vertical alignment of single rows of flex items with the .align-items-* classes. Valid classes are .align-items-start, .align-items-end, .align-items-center, .align-items-baseline, and .align-items-stretch (default).

Click on the buttons below to see the difference between the five classes:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<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-around">..</div>

<div class="d-flex align-items-stretch">..</div>
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Align Self

Control the vertical alignment of a specified flex item with the .align-self-* classes. Valid classes are .align-self-start, .align-self-end, .align-self-center, .align-self-baseline, and .align-self-stretch (default).

Click on the buttons below to see the difference between the five classes:

Example

Flex item 1
Flex item 2
Flex item 3

Example

<div class="d-flex bg-light" style="height:150px">
  <div class="p-2 border">Flex item 1</div>
  <div class="p-2 border align-self-start">Flex item 2</div>
  <div class="p-2 border">Flex item 3</div>
</div>
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Responsive Flex Classes

All flex classes comes with additional responsive classes, which makes it easy to set a specific flex class on a specific screen size.

The * symbol can be replaced with sm, md, lg or xl, which represents small, medium, large or xlarge screens.

Class Description Example
Flex Container    
.d-*-flex Creates a flexbox container for different screens Try it
.d-*-inline-flex Creates an inline flexbox container for different screens Try it
Direction    
.flex-*-row Display flex items horizontally on different screens Try it
.flex-*-row-reverse Display flex items horizontally, and right-aligned, on different screens Try it
.flex-*-column Display flex items vertically on different screens Try it
.flex-*-column-reverse Display flex items vertically, with reversed order, on different screens screens Try it
Justified Content    
.justify-content-*-start Display flex items from the start (left-aligned) on different screens Try it
.justify-content-*-end Display flex items at the end (right-aligned) on different screens Try it
.justify-content-*-center Display flex items in the center of a flex container on different screens Try it
.justify-content-*-between Display flex items in "between" on different screens Try it
.justify-content-*-around Display flex items "around" on different screens Try it
Fill / Equal Width    
.flex-*-fill Force flex items into equal widths on different screens Try it
Grow    
.flex-*-grow-0 Don't make the items grow on different screens  
.flex-*-grow-1 Make items grow on different screens  
Shrink    
.flex-*-shrink-0 Don't make the items shrink on diferent screens  
.flex-*-shrink-1 Make items shrink on different screens  
Order    
.order-*-0-12 Change the order from 0 to 12 on small screens Try it
Wrap    
.flex-*-nowrap Don't wrap items on different screens Try it
.flex-*-wrap Wrap items on different screens Try it
.flex-*-wrap-reverse Reverse the wrapping of items on different screens Try it
Align Content    
.align-content-*-start Align gathered items from the start on different screens Try it
.align-content-*-end Align gathered items at the end on different screens Try it
.align-content-*-center Align gathered items in the center on different screens Try it
.align-content-*-around Align gathered items "around" on different screens Try it
.align-content-*-stretch Stretch gathered items on different screens Try it
Align Items    
.align-items-*-start Align single rows of items from the start on different screens Try it
.align-items-*-end Align single rows of items at the end on different screens Try it
.align-items-*-center Align single rows of items in the center on different screens Try it
.align-items-*-baseline Align single rows of items on the baseline on different screens Try it
.align-items-*-stretch Stretch single rows of items on different screens Try it
Align Self    
.align-self-*-start Align a flex item from the start on different screens Try it
.align-self-*-end Align a flex item at the end on different screens Try it
.align-self-*-center Align a flex item in the center on different screens Try it
.align-self-*-baseline Align a flex item on the baseline on different screens Try it
.align-self-*-stretch Stretch a flex item on different screens Try it