CSS flex Property

Example

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

#main div {
  -ms-flex: 1; /* IE 10 */
  flex: 1;
}

Definition and Usage

The flex property is a shorthand property for:

• flex-grow - How the element should expand with respect to another flex-items.
• flex-shrink - How the element should shrink with respect to another flex-items.
• flex-basis - Minimum Width for the flex-items.

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.
Version:	CSS3
JavaScript syntax:	object.style.flex="1"

• Inherited : "Inherited = no" means that it cannot takes (inherit) it's value from it's parent element.
• object - object in javascript means the element on which flex is applied.
• Animatable - "Animatable = yes" means that it can be animated with CSS @keyframes.

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
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.
none	Same as 0 0 auto.
inherit	Inherits this property from its parent element.

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%;
  }
}