W3cubDocs

/CSS

justify-content

The CSS justify-content property defines how the browser distributes space between and around content items along the main-axis of a flex container, and the inline axis of a grid container.

The interactive example below demonstrates some of the values using Grid Layout.

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.

Syntax

/* Positional alignment */
justify-content: center;     /* Pack items around the center */
justify-content: start;      /* Pack items from the start */
justify-content: end;        /* Pack items from the end */
justify-content: flex-start; /* Pack flex items from the start */
justify-content: flex-end;   /* Pack flex items from the end */
justify-content: left;       /* Pack items from the left */
justify-content: right;      /* Pack items from the right */

/* Baseline alignment */
/* justify-content does not take baseline values */

/* Normal alignment */
justify-content: normal;

/* Distributed alignment */
justify-content: space-between; /* Distribute items evenly
                                   The first item is flush with the start,
                                   the last is flush with the end */
justify-content: space-around;  /* Distribute items evenly
                                   Items have a half-size space
                                   on either end */
justify-content: space-evenly;  /* Distribute items evenly
                                   Items have equal space around them */
justify-content: stretch;       /* Distribute items evenly
                                   Stretch 'auto'-sized items to fit
                                   the container */

/* Overflow alignment */
justify-content: safe center;
justify-content: unsafe center;

/* Global values */
justify-content: inherit;
justify-content: initial;
justify-content: unset;

Values

start
The items are packed flush to each other toward the start edge of the alignment container in the main axis.
end
The items are packed flush to each other toward the end edge of the alignment container in the main axis.
flex-start
The items are packed flush to each other toward the edge of the alignment container depending on the flex container's main-start side.
This only applies to flex layout items. For items that are not children of a flex container, this value is treated like start.
flex-end
The items are packed flush to each other toward the edge of the alignment container depending on the flex container's main-end side.
This only applies to flex layout items. For items that are not children of a flex container, this value is treated like end.
center
The items are packed flush to each other toward the center of the alignment container along the main axis.
left
The items are packed flush to each other toward the left edge of the alignment container. If the property’s axis is not parallel with the inline axis, this value behaves like start.
right
The items are packed flush to each other toward the right edge of the alignment container in the appropriate axis. If the property’s axis is not parallel with the inline axis, this value behaves like start.
normal
The items are packed in their default position as if no justify-content value was set. This value behaves as stretch in grid and flex containers.
baseline
first baseline

last baseline
Specifies participation in first- or last-baseline alignment: aligns the alignment baseline of the box’s first or last baseline set with the corresponding baseline in the shared first or last baseline set of all the boxes in its baseline-sharing group.
The fallback alignment for first baseline is start, the one for last baseline is end.
space-between
The items are evenly distributed within the alignment container along the main axis. The spacing between each pair of adjacent items is the same. The first item is flush with the main-start edge, and the last item is flush with the main-end edge.
space-around
The items are evenly distributed within the alignment container along the main axis. The spacing between each pair of adjacent items is the same. The empty space before the first and after the last item equals half of the space between each pair of adjacent items.
space-evenly
The items are evenly distributed within the alignment container along the main axis. The spacing between each pair of adjacent items, the main-start edge and the first item, and the main-end edge and the last item, are all exactly the same.
stretch

If the combined size of the items along the main axis is less than the size of the alignment container, any auto-sized items have their size increased equally (not proportionally), while still respecting the constraints imposed by max-height/max-width (or equivalent functionality), so that the combined size exactly fills the alignment container along the main axis.

Note: stretch is not supported by flexible boxes (flexbox).

safe
Used alongside an alignment keyword. If the chosen keyword means that the item overflows the alignment container causing data loss, the item is instead aligned as if the alignment mode were start.
unsafe
Used alongside an alignment keyword. Regardless of the relative sizes of the item and alignment container, and regardless of whether overflow which causes data loss might happen, the given alignment value is honored.

Formal definition

Initial value normal
Applies to flex containers
Inherited no
Computed value as specified
Animation type discrete

Formal syntax

normal | <content-distribution> | <overflow-position>? [ <content-position> | left | right ]

where
<content-distribution> = space-between | space-around | space-evenly | stretch
<overflow-position> = unsafe | safe
<content-position> = center | start | end | flex-start | flex-end

Examples

Setting flex item distribution

CSS

#container {
  display: flex;
  justify-content: space-between; /* Can be changed in the live sample */
}

#container > div {
  width: 100px;
  height: 100px;
  background: linear-gradient(-45deg, #788cff, #b4c8ff);
}

Result

Specifications

Specification Status Comment
CSS Box Alignment Module Level 3
The definition of 'justify-content' in that specification.
Working Draft Adds the [ first | last ]? baseline, self-start, self-end, start, end, left, right, unsafe | safe values.
CSS Flexible Box Layout Module
The definition of 'justify-content' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHubUpdate compatibility data on GitHub

Support in Flex layout

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Supported in Flex Layout 52
52
29
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
21
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
12
12
12
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
20
20
Before Firefox 27, Firefox supported only single-line flexbox.
18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
11 12.1 9
9
6.1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
baseline 57 79 45 — 60
45 — 60
justify-content no longer accepts baseline values
No 44 No
first baseline and last baseline No No 52 — 60
52 — 60
justify-content no longer accepts baseline values
No No No
left and right No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
52 No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
9
safe and unsafe No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
63 No No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
space-evenly 60 79 52 No 47 11
start and end No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
45 No No
No
This value is recognized, but has no effect.
9
stretch 57 79 52 No 44 9
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Supported in Flex Layout 52
52
4.4
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
≤37
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
52
52
29
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
25
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
20
20
Before Firefox 27, Firefox supported only single-line flexbox.
18 — 20
Disabled
Disabled From version 18 until version 20 (exclusive): this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
49
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
48
Prefixed Disabled
Prefixed Implemented with the vendor prefix: -webkit-
Disabled From version 48: this feature is behind the layout.css.prefixes.webkit preference (needs to be set to true). To change preferences in Firefox, visit about:config.
12.1 9
9
6.1
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
6.0
6.0
2.0
Older versions of the specification treat absolute positioned children as though they are a 0 by 0 flex item. Later specification versions take the children out of the flow and set their positions based on align and justify properties. Chrome implements the new behavior beginning with Chrome 52.
1.5
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
baseline 57 57 45 — 60
45 — 60
justify-content no longer accepts baseline values
43 No 7.0
first baseline and last baseline No No 52 — 60
52 — 60
justify-content no longer accepts baseline values
No No No
left and right No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
52 No
No
This value is recognized, but has no effect.
9 No
No
This value is recognized, but has no effect.
safe and unsafe No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
63 No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
space-evenly 60 60 52 44 11 8.0
start and end No
No
This value is recognized, but has no effect.
No
No
This value is recognized, but has no effect.
45 No
No
This value is recognized, but has no effect.
9 No
No
This value is recognized, but has no effect.
stretch 57 57 52 43 9 7.0

Support in Grid layout

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Supported in Grid Layout 57 16 52 No 44 10.1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
Supported in Grid Layout 57 52 52 43 10.3 6.2

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/justify-content