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. The .d-flex class makes the flex container a block-level element. The .d-inline-flex class makes the flex container an atomic inline-level element. Please note: an anonymous flex item that contains only white space is not rendered, as if it were designated display: none. Also clear and vertical-align properties have no effect on flex items, and float causes the display property of the element to compute to block.

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

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, or around values. The alignment is done after the lengths and auto margins are applied, meaning that, if in a Flexbox layout there is at least one flexible element, with flex-grow different from 0, it will have no effect as there won't be any available space.

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). Basically it works like justify-content, but in the perpendicular direction. Tip: use the align-self property of each item to override the align-items property.

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). The property doesn't apply to block-level boxes, or to table cells.

Flex 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 stretch

Equivalent to flex: [positive-number] 1 0. Makes the flex item flexible and sets the flex basis to zero, resulting in an item that receives the specified proportion of the free space in the flex container. If all items in the flex container use this pattern, their sizes will be proportional to the specified flex factor. Other words it's similar to .flex-fill, but forces elements to stretch equally regardless content length. To reset .flex-1 use .flex-0 class.

Grow and shrink

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). Unfortunately, IE10 and IE11 do not properly support auto margins on flex items whose parent has a non-default justify-content value.

Flex wrap

The flex-wrap classes specify whether flex items are forced into a single line or can be wrapped onto multiple lines. If wrapping is allowed, this property also enables you to control the direction in which lines are stacked. Note: if the elements are not flexible items, the flex-wrap property has no effect. Supports 2 directions: default and reversed.

Flex 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 (e.g., 5), add custom CSS for any additional values needed. Elements with the same order value are laid out in the order in which they appear in the source code. Note: If the element is not a flexible item, the order property has no effect.

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. Note: this property has no effect on single rows of flex items.