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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.

/* <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
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.


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


See <number>. Negative values are invalid.

Formal syntax




<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>


#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);



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

Browser compatibility

Feature Firefox (Gecko) Chrome Edge Internet Explorer Opera Safari
Basic support 18.0 (18.0)[1] 21.0-webkit (Yes)-webkit
11[3] 12.10 6.1-webkit
< 0 animate 32.0 (32.0)[2] 49.0 ? ? No support No support
Feature Firefox Mobile (Gecko) Android Edge IE Phone Opera Mobile Safari Mobile
Basic support 18.0 (18.0)[1] ? (Yes)-webkit
No support 12.10 No support
< 0 animate 32.0 (32.0)[2] ? ? ? No support No support

[1] Firefox supports only single-line flexbox until Firefox 27. To activate flexbox support, for Firefox 18 and 19, the user has to change the about:config preference layout.css.flexbox.enabled to true.

In addition to the unprefixed support, Gecko 48.0 (Firefox 48.0 / Thunderbird 48.0 / SeaMonkey 2.45) added support for a -webkit prefixed version of the property for web compatibility reasons behind the preference layout.css.prefixes.webkit, defaulting to false. Since Gecko 49.0 (Firefox 49.0 / Thunderbird 49.0 / SeaMonkey 2.46) the preference defaults to true.

[2] Before Firefox 32, Gecko wasn't able to animate values starting or stopping at 0(SpecDemo).

[3] IE 10 implements this as its special prefixed property: -ms-flex-positive.

See also

Document Tags and Contributors

 Last updated by: irnc,