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align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-decoration-break box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-feature-settings font-kerning font-size font-size-adjust font-stretch font-style font-variant font-variant-caps font-weight gap grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-gap grid-column-start grid-gap grid-row grid-row-end grid-row-gap grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens @import isolation justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top max-height max-width @media min-height min-width mix-blend-mode object-fit object-position opacity order outline outline-color outline-offset outline-style outline-width overflow overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin pointer-events position quotes resize right row-gap scroll-behavior tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi user-select vertical-align visibility white-space width word-break word-spacing word-wrap writing-mode z-index

CSS flex Property


Let all the flexible items be the same length, regardless of its content:

#main div {
  -ms-flex: 1; /* IE 10 */
  flex: 1;
Try it Yourself »

Tip: More "Try it Yourself" examples below.

Definition and Usage

The flex property is a shorthand property for:

The flex property sets the flexible length on flexible items.

Note: If the element is not a flexible item, the flex property has no effect.

Default value: 0 1 auto
Inherited: no
Animatable: yes, see individual properties. Read about animatable
Version: CSS3
JavaScript syntax:"1" Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Numbers followed by -webkit-, -ms- or -moz- specify the first version that worked with a prefix.

flex 29.0
21.0 -webkit-
10.0 -ms-
18.0 -moz-
6.1 -webkit-

CSS Syntax

flex: flex-grow flex-shrink flex-basis|auto|initial|inherit;

Property Values

Value Description
flex-grow A number specifying how much the item will grow relative to the rest of the flexible items
flex-shrink A number specifying how much the item will shrink relative to the rest of the flexible items
flex-basis The length of the item. Legal values: "auto", "inherit", or a number followed by "%", "px", "em" or any other length unit
auto Same as 1 1 auto.
initial Same as 0 1 auto. Read about initial
none Same as 0 0 auto.
inherit Inherits this property from its parent element. Read about inherit

More Examples


Using flex together with media queries to create a different layout for different screen sizes/devices:

.flex-container {
  display: flex;
  flex-wrap: wrap;

.flex-item-left {
  flex: 50%;

.flex-item-right {
  flex: 50%;

/* Responsive layout - makes a one column layout (100%) instead of a two-column layout (50%) */
@media (max-width: 800px) {
  .flex-item-right, .flex-item-left {
    flex: 100%;
Try it Yourself »

Related Pages

CSS Tutorial: CSS Flexible Box

CSS Reference: flex-basis property

CSS Reference: flex-direction property

CSS Reference: flex-flow property

CSS Reference: flex-grow property

CSS Reference: flex-shrink property

CSS Reference: flex-wrap property

HTML DOM reference: flex property