The flex-grow CSS property specifies the flex grow factor of a flex item. It specifies what amount of space inside the flex container the item should take up. The flex grow factor of a flex item is relative to the size of the other children in the flex-container.

/* <number> values */
flex-grow: 3;
flex-grow: 0.6;

/* Global values */
flex-grow: inherit;
flex-grow: initial;
flex-grow: unset;

Initial value0
Applies toflex items, including in-flow pseudo-elements
Inheritedno
Mediavisual
Computed valueas specified
Animation typea number
Canonical orderthe unique non-ambiguous order defined by the formal grammar

See Using CSS flexible boxes for more properties and information.

Syntax

The flex-grow property is specified as a single <number>.

Values

<number>
See <number>. Negative values are invalid.

Formal syntax

<number>

Example

HTML

<h4>This is a Flex-Grow</h4>
<h5>A,B,C and F are flex-grow:1 . D and E are flex-grow:2 .</h5>
<div id="content">
  <div class="box" style="background-color:red;">A</div>
  <div class="box" style="background-color:lightblue;">B</div>
  <div class="box" style="background-color:yellow;">C</div>
  <div class="box1" style="background-color:brown;">D</div>
  <div class="box1" style="background-color:lightgreen;">E</div>
  <div class="box" style="background-color:brown;">F</div>
</div>

CSS

#content {
  -ms-box-orient: horizontal;
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -moz-flex;
  display: -webkit-flex;
  display: flex;
    
  -webkit-justify-content: space-around;
  justify-content: space-around;
  -webkit-flex-flow: row wrap;
  flex-flow: row wrap;
  -webkit-align-items: stretch;
  align-items: stretch;
}

.box {
  flex-grow: 1;
  border: 3px solid rgba(0,0,0,.2);
}

.box1 {
  flex-grow: 2;
  border: 3px solid rgba(0,0,0,.2);
}

Result

Specifications

Specification Status Comment
CSS Flexible Box Layout Module
The definition of 'flex-grow' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic Support21 -webkit-

(Yes)

(Yes) -webkit-

201

18 — 202

113

12.10

15 -webkit-

6.1 -webkit-
<0 animate49 ?324 ? No No
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support ? ?

(Yes)

(Yes) -webkit-

201

18 — 202

No

12.10

15 -webkit-

?
<0 animate ? ? ?324 ? No No

1. Since Firefox 28, multi-line flexbox is supported.

2. 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.

3. Supported as -ms-flex-positive.

4. Before Firefox 32, Firefox wasn't able to animate values starting or stopping at 0.

See also