Enable flex behaviors

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.

Flex - 图1

  1. <div class="d-flex p-2 bd-highlight">I'm a flexbox container!</div>

Flex - 图2

  1. <div class="d-inline-flex p-2 bd-highlight">I'm an inline flexbox container!</div>

Responsive variations also exist for .d-flex and .d-inline-flex.

  • .d-flex
  • .d-inline-flex
  • .d-sm-flex
  • .d-sm-inline-flex
  • .d-md-flex
  • .d-md-inline-flex
  • .d-lg-flex
  • .d-lg-inline-flex
  • .d-xl-flex
  • .d-xl-inline-flex
  • .d-xxl-flex
  • .d-xxl-inline-flex

Direction

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.

Flex - 图3

  1. <div class="d-flex flex-row bd-highlight mb-3">
  2.   <div class="p-2 bd-highlight">Flex item 1</div>
  3.   <div class="p-2 bd-highlight">Flex item 2</div>
  4.   <div class="p-2 bd-highlight">Flex item 3</div>
  5. </div>
  6. <div class="d-flex flex-row-reverse bd-highlight">
  7.   <div class="p-2 bd-highlight">Flex item 1</div>
  8.   <div class="p-2 bd-highlight">Flex item 2</div>
  9.   <div class="p-2 bd-highlight">Flex item 3</div>
  10. </div>

Use .flex-column to set a vertical direction, or .flex-column-reverse to start the vertical direction from the opposite side.

Flex - 图4

  1. <div class="d-flex flex-column bd-highlight mb-3">
  2.   <div class="p-2 bd-highlight">Flex item 1</div>
  3.   <div class="p-2 bd-highlight">Flex item 2</div>
  4.   <div class="p-2 bd-highlight">Flex item 3</div>
  5. </div>
  6. <div class="d-flex flex-column-reverse bd-highlight">
  7.   <div class="p-2 bd-highlight">Flex item 1</div>
  8.   <div class="p-2 bd-highlight">Flex item 2</div>
  9.   <div class="p-2 bd-highlight">Flex item 3</div>
  10. </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
  • .flex-xxl-row
  • .flex-xxl-row-reverse
  • .flex-xxl-column
  • .flex-xxl-column-reverse

Justify content

Use justify-content utilities 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). Choose from start (browser default), end, center, between, around, or evenly.

Flex - 图5

  1. <div class="d-flex justify-content-start">...</div>
  2. <div class="d-flex justify-content-end">...</div>
  3. <div class="d-flex justify-content-center">...</div>
  4. <div class="d-flex justify-content-between">...</div>
  5. <div class="d-flex justify-content-around">...</div>
  6. <div class="d-flex justify-content-evenly">...</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-evenly
  • .justify-content-sm-start
  • .justify-content-sm-end
  • .justify-content-sm-center
  • .justify-content-sm-between
  • .justify-content-sm-around
  • .justify-content-sm-evenly
  • .justify-content-md-start
  • .justify-content-md-end
  • .justify-content-md-center
  • .justify-content-md-between
  • .justify-content-md-around
  • .justify-content-md-evenly
  • .justify-content-lg-start
  • .justify-content-lg-end
  • .justify-content-lg-center
  • .justify-content-lg-between
  • .justify-content-lg-around
  • .justify-content-lg-evenly
  • .justify-content-xl-start
  • .justify-content-xl-end
  • .justify-content-xl-center
  • .justify-content-xl-between
  • .justify-content-xl-around
  • .justify-content-xl-evenly
  • .justify-content-xxl-start
  • .justify-content-xxl-end
  • .justify-content-xxl-center
  • .justify-content-xxl-between
  • .justify-content-xxl-around
  • .justify-content-xxl-evenly

Align items

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). Choose from start, end, center, baseline, or stretch (browser default).

Flex - 图6

  1. <div class="d-flex align-items-start">...</div>
  2. <div class="d-flex align-items-end">...</div>
  3. <div class="d-flex align-items-center">...</div>
  4. <div class="d-flex align-items-baseline">...</div>
  5. <div class="d-flex align-items-stretch">...</div>

Responsive variations also exist for align-items.

  • .align-items-start
  • .align-items-end
  • .align-items-center
  • .align-items-baseline
  • .align-items-stretch
  • .align-items-sm-start
  • .align-items-sm-end
  • .align-items-sm-center
  • .align-items-sm-baseline
  • .align-items-sm-stretch
  • .align-items-md-start
  • .align-items-md-end
  • .align-items-md-center
  • .align-items-md-baseline
  • .align-items-md-stretch
  • .align-items-lg-start
  • .align-items-lg-end
  • .align-items-lg-center
  • .align-items-lg-baseline
  • .align-items-lg-stretch
  • .align-items-xl-start
  • .align-items-xl-end
  • .align-items-xl-center
  • .align-items-xl-baseline
  • .align-items-xl-stretch
  • .align-items-xxl-start
  • .align-items-xxl-end
  • .align-items-xxl-center
  • .align-items-xxl-baseline
  • .align-items-xxl-stretch

Align self

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). Choose from the same options as align-items: start, end, center, baseline, or stretch (browser default).

Flex - 图7

  1. <div class="align-self-start">Aligned flex item</div>
  2. <div class="align-self-end">Aligned flex item</div>
  3. <div class="align-self-center">Aligned flex item</div>
  4. <div class="align-self-baseline">Aligned flex item</div>
  5. <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
  • .align-self-xxl-start
  • .align-self-xxl-end
  • .align-self-xxl-center
  • .align-self-xxl-baseline
  • .align-self-xxl-stretch

Fill

Use the .flex-fill class on a series of sibling elements to force them into widths equal to their content (or equal widths if their content does not surpass their border-boxes) while taking up all available horizontal space.

Flex - 图8

  1. <div class="d-flex bd-highlight">
  2.   <div class="p-2 flex-fill bd-highlight">Flex item with a lot of content</div>
  3.   <div class="p-2 flex-fill bd-highlight">Flex item</div>
  4.   <div class="p-2 flex-fill bd-highlight">Flex item</div>
  5. </div>

Responsive variations also exist for flex-fill.

  • .flex-fill
  • .flex-sm-fill
  • .flex-md-fill
  • .flex-lg-fill
  • .flex-xl-fill
  • .flex-xxl-fill

Grow and shrink

Use .flex-grow-* utilities to toggle a flex item’s ability to grow to fill available space. In the example below, the .flex-grow-1 elements uses all available space it can, while allowing the remaining two flex items their necessary space.

Flex - 图9

  1. <div class="d-flex bd-highlight">
  2.   <div class="p-2 flex-grow-1 bd-highlight">Flex item</div>
  3.   <div class="p-2 bd-highlight">Flex item</div>
  4.   <div class="p-2 bd-highlight">Third flex item</div>
  5. </div>

Use .flex-shrink-* utilities 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 its contents to a new line, “shrinking” to allow more space for the previous flex item with .w-100.

Flex - 图10

  1. <div class="d-flex bd-highlight">
  2.   <div class="p-2 w-100 bd-highlight">Flex item</div>
  3.   <div class="p-2 flex-shrink-1 bd-highlight">Flex item</div>
  4. </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
  • .flex-xxl-{grow|shrink}-0
  • .flex-xxl-{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 (.me-auto), and pushing two items to the left (.ms-auto).

Flex - 图11

  1. <div class="d-flex bd-highlight mb-3">
  2.   <div class="p-2 bd-highlight">Flex item</div>
  3.   <div class="p-2 bd-highlight">Flex item</div>
  4.   <div class="p-2 bd-highlight">Flex item</div>
  5. </div>
  7. <div class="d-flex bd-highlight mb-3">
  8.   <div class="me-auto p-2 bd-highlight">Flex item</div>
  9.   <div class="p-2 bd-highlight">Flex item</div>
  10.   <div class="p-2 bd-highlight">Flex item</div>
  11. </div>
  13. <div class="d-flex bd-highlight mb-3">
  14.   <div class="p-2 bd-highlight">Flex item</div>
  15.   <div class="p-2 bd-highlight">Flex item</div>
  16.   <div class="ms-auto p-2 bd-highlight">Flex item</div>
  17. </div>

With align-items

Vertically 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.

Flex - 图12

  1. <div class="d-flex align-items-start flex-column bd-highlight mb-3" style="height: 200px;">
  2.   <div class="mb-auto p-2 bd-highlight">Flex item</div>
  3.   <div class="p-2 bd-highlight">Flex item</div>
  4.   <div class="p-2 bd-highlight">Flex item</div>
  5. </div>
  7. <div class="d-flex align-items-end flex-column bd-highlight mb-3" style="height: 200px;">
  8.   <div class="p-2 bd-highlight">Flex item</div>
  9.   <div class="p-2 bd-highlight">Flex item</div>
  10.   <div class="mt-auto p-2 bd-highlight">Flex item</div>
  11. </div>

Wrap

Change how flex items wrap in a flex container. Choose from no wrapping at all (the browser default) with .flex-nowrap, wrapping with .flex-wrap, or reverse wrapping with .flex-wrap-reverse.

Flex - 图13

  1. <div class="d-flex flex-nowrap">
  2.   ...
  3. </div>

Flex - 图14

  1. <div class="d-flex flex-wrap">
  2.   ...
  3. </div>

Flex - 图15

  1. <div class="d-flex flex-wrap-reverse">
  2.   ...
  3. </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
  • .flex-xxl-nowrap
  • .flex-xxl-wrap
  • .flex-xxl-wrap-reverse

Order

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 takes any integer value from 0 to 5, add custom CSS for any additional values needed.

Flex - 图16

  1. <div class="d-flex flex-nowrap bd-highlight">
  2.   <div class="order-3 p-2 bd-highlight">First flex item</div>
  3.   <div class="order-2 p-2 bd-highlight">Second flex item</div>
  4.   <div class="order-1 p-2 bd-highlight">Third flex item</div>
  5. </div>

Responsive variations also exist for order.

  • .order-0
  • .order-1
  • .order-2
  • .order-3
  • .order-4
  • .order-5
  • .order-sm-0
  • .order-sm-1
  • .order-sm-2
  • .order-sm-3
  • .order-sm-4
  • .order-sm-5
  • .order-md-0
  • .order-md-1
  • .order-md-2
  • .order-md-3
  • .order-md-4
  • .order-md-5
  • .order-lg-0
  • .order-lg-1
  • .order-lg-2
  • .order-lg-3
  • .order-lg-4
  • .order-lg-5
  • .order-xl-0
  • .order-xl-1
  • .order-xl-2
  • .order-xl-3
  • .order-xl-4
  • .order-xl-5
  • .order-xxl-0
  • .order-xxl-1
  • .order-xxl-2
  • .order-xxl-3
  • .order-xxl-4
  • .order-xxl-5

Additionally there are also responsive .order-first and .order-last classes that change the order of an element by applying order: -1 and order: 6, respectively.

  • .order-first
  • .order-last
  • .order-sm-first
  • .order-sm-last
  • .order-md-first
  • .order-md-last
  • .order-lg-first
  • .order-lg-last
  • .order-xl-first
  • .order-xl-last
  • .order-xxl-first
  • .order-xxl-last

Align content

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.

Heads up! This property has no effect on single rows of flex items.

Flex - 图17

  1. <div class="d-flex align-content-start flex-wrap">
  2.   ...
  3. </div>

Flex - 图18

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

Flex - 图19

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

Flex - 图20

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

Flex - 图21

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

Flex - 图22

  1. <div class="d-flex align-content-stretch 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
  • .align-content-xxl-start
  • .align-content-xxl-end
  • .align-content-xxl-center
  • .align-content-xxl-around
  • .align-content-xxl-stretch

Media object

Looking to replicate the media object component from Bootstrap 4? Recreate it in no time with a few flex utilities that allow even more flexibility and customization than before.

Flex - 图23

  1. <div class="d-flex">
  2.   <div class="flex-shrink-0">
  3.     <img src="..." alt="...">
  4.   </div>
  5.   <div class="flex-grow-1 ms-3">
  6.     This is some content from a media component. You can replace this with any content and adjust it as needed.
  7.   </div>
  8. </div>

And say you want to vertically center the content next to the image:

Flex - 图24

  1. <div class="d-flex align-items-center">
  2.   <div class="flex-shrink-0">
  3.     <img src="..." alt="...">
  4.   </div>
  5.   <div class="flex-grow-1 ms-3">
  6.     This is some content from a media component. You can replace this with any content and adjust it as needed.
  7.   </div>
  8. </div>

Sass

Utilities API

Flexbox utilities are declared in our utilities API in scss/_utilities.scss. Learn how to use the utilities API.

  1.     "flex": (
  2.       responsive: true,
  3.       property: flex,
  4.       values: (fill: 1 1 auto)
  5.     ),
  6.     "flex-direction": (
  7.       responsive: true,
  8.       property: flex-direction,
  9.       class: flex,
  10.       values: row column row-reverse column-reverse
  11.     ),
  12.     "flex-grow": (
  13.       responsive: true,
  14.       property: flex-grow,
  15.       class: flex,
  16.       values: (
  17.         grow-0: 0,
  18.         grow-1: 1,
  19.       )
  20.     ),
  21.     "flex-shrink": (
  22.       responsive: true,
  23.       property: flex-shrink,
  24.       class: flex,
  25.       values: (
  26.         shrink-0: 0,
  27.         shrink-1: 1,
  28.       )
  29.     ),
  30.     "flex-wrap": (
  31.       responsive: true,
  32.       property: flex-wrap,
  33.       class: flex,
  34.       values: wrap nowrap wrap-reverse
  35.     ),
  36.     "gap": (
  37.       responsive: true,
  38.       property: gap,
  39.       class: gap,
  40.       values: $spacers
  41.     ),
  42.     "justify-content": (
  43.       responsive: true,
  44.       property: justify-content,
  45.       values: (
  46.         start: flex-start,
  47.         end: flex-end,
  48.         center: center,
  49.         between: space-between,
  50.         around: space-around,
  51.         evenly: space-evenly,
  52.       )
  53.     ),
  54.     "align-items": (
  55.       responsive: true,
  56.       property: align-items,
  57.       values: (
  58.         start: flex-start,
  59.         end: flex-end,
  60.         center: center,
  61.         baseline: baseline,
  62.         stretch: stretch,
  63.       )
  64.     ),
  65.     "align-content": (
  66.       responsive: true,
  67.       property: align-content,
  68.       values: (
  69.         start: flex-start,
  70.         end: flex-end,
  71.         center: center,
  72.         between: space-between,
  73.         around: space-around,
  74.         stretch: stretch,
  75.       )
  76.     ),
  77.     "align-self": (
  78.       responsive: true,
  79.       property: align-self,
  80.       values: (
  81.         auto: auto,
  82.         start: flex-start,
  83.         end: flex-end,
  84.         center: center,
  85.         baseline: baseline,
  86.         stretch: stretch,
  87.       )
  88.     ),
  89.     "order": (
  90.       responsive: true,
  91.       property: order,
  92.       values: (
  93.         first: -1,
  94.         0: 0,
  95.         1: 1,
  96.         2: 2,
  97.         3: 3,
  98.         4: 4,
  99.         5: 5,
  100.         last: 6,
  101.       ),
  102.     ),