The CSS justify-content property defines how the browser distributes space between and around content items along the main axis of their container.

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 */
align-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 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.
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 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.
safe
If the size of the item overflows the alignment container, the item is instead aligned as if the alignment mode were start.
unsafe
Regardless of the relative sizes of the item and alignment container, the given alignment value is honored.

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

Example

CSS content

#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
Initial valuenormal
Applies toflex containers
Inheritedno
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support

52

291

21 -webkit-

12

12 -webkit-

202

18 —?3

49 -webkit-

48 -webkit- 4

1112.19
space-evenly60 No52 No No No
start and end Yes5 No Yes No Yes5 ?
left and right Yes5 No

52

Yes5

Yes5 Yes5 ?
baseline57 No Yes — 606 No ? ?
first baseline and last baseline No No52 — 606 No No ?
stretch57 No52 No44 ?
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support

52

291

21 -webkit-

52

291

21 -webkit-

Yes

Yes -webkit-

?12.1 ? Yes
space-evenly No No No52 No No No
start and end ? ? ? ? ? ? ?
left and right ? ? ?

52

Yes5

? ? ?
baseline ? ? No Yes — 606 ? ? ?
first baseline and last baseline ? ? No52 — 606 ? ? No
stretch ? ? No52 ? ? ?

1. 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.

2. Before Firefox 27, Firefox supported only single-line flexbox.

3. From version 18: this feature is behind the layout.css.flexbox.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.

4. 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.

5. This value is recognized, but has no effect.

6. justify-content no longer accepts baseline values

 

See also