CSS flex Property

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Example

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.

Show demo ❯

Default value:	0 1 auto
Inherited:	no
Animatable:	yes, see individual properties. Read about animatable
Version:	CSS3
JavaScript syntax:	object.style.flex="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.

Property
flex	29.0 21.0 -webkit-	11.0 10.0 -ms-	28.0 18.0 -moz-	9.0 6.1 -webkit-	17.0

CSS Syntax

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

Property Values

Value	Description	Demo
flex-grow	A number specifying how much the item will grow relative to the rest of the flexible items	Demo ❯
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	Demo ❯
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

Example

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 »

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

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