Css flex default value

CSS flex Property

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

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:	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.

CSS Syntax

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;
>

/* 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%;
>
>

Источник

flex

Baseline is determined by this web feature being supported on the current and the previous major versions of major browsers.

The flex CSS shorthand property sets how a flex item will grow or shrink to fit the space available in its flex container.

Try it

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* Keyword values */ flex: auto; flex: initial; flex: none; /* One value, unitless number: flex-grow flex-basis is then equal to 0. */ flex: 2; /* One value, width/height: flex-basis */ flex: 10em; flex: 30%; flex: min-content; /* Two values: flex-grow | flex-basis */ flex: 1 30px; /* Two values: flex-grow | flex-shrink */ flex: 2 2; /* Three values: flex-grow | flex-shrink | flex-basis */ flex: 2 2 10%; /* Global values */ flex: inherit; flex: initial; flex: revert; flex: revert-layer; flex: unset; 

The flex property may be specified using one, two, or three values.

• One-value syntax: the value must be one of:
  • a valid value for : then the shorthand expands to flex: 1 0 .
  • a valid value for : then the shorthand expands to flex: 1 1 .
  • the keyword none or one of the global keywords.
  • The first value must be a valid value for flex-grow .
  • The second value must be one of:
    • a valid value for flex-shrink : then the shorthand expands to flex: 0 .
    • a valid value for flex-basis : then the shorthand expands to flex: 1 .
    1. a valid value for flex-grow .
    2. a valid value for flex-shrink .
    3. a valid value for flex-basis .

    Values

    The item is sized according to its width and height properties. It shrinks to its minimum size to fit the container, but does not grow to absorb any extra free space in the flex container. This is equivalent to setting » flex: 0 1 auto «.

    The item is sized according to its width and height properties, but grows to absorb any extra free space in the flex container, and shrinks to its minimum size to fit the container. This is equivalent to setting » flex: 1 1 auto «.

    The item is sized according to its width and height properties. It is fully inflexible: it neither shrinks nor grows in relation to the flex container. This is equivalent to setting » flex: 0 0 auto «.

    Defines the flex-grow of the flex item. Negative values are considered invalid. Defaults to 1 when omitted. (initial is 0 )

    Defines the flex-shrink of the flex item. Negative values are considered invalid. Defaults to 1 when omitted. (initial is 1 )

    Defines the flex-basis of the flex item. A preferred size of 0 must have a unit to avoid being interpreted as a flexibility. Defaults to 0 when omitted. (initial is auto )

    Description

    For most purposes, authors should set flex to one of the following values: auto , initial , none , or a positive unitless number. To see the effect of these values, try resizing the flex containers below:

    div class="flex-container"> div class="item auto">autodiv> div class="item auto">autodiv> div class="item auto">autodiv> div> div class="flex-container"> div class="item auto">autodiv> div class="item initial">initialdiv> div class="item initial">initialdiv> div> div class="flex-container"> div class="item auto">autodiv> div class="item auto">autodiv> div class="item none">nonediv> div> div class="flex-container"> div class="item initial">initialdiv> div class="item none">nonediv> div class="item none">nonediv> div> div class="flex-container"> div class="item four">4div> div class="item two">2div> div class="item one">1div> div> 

    *  box-sizing: border-box; > .flex-container  background-color: #f4f7f8; resize: horizontal; overflow: hidden; display: flex; margin: 1em; > .item  margin: 1em; padding: 0.5em; width: 110px; min-width: 0; background-color: #1b5385; color: white; font-family: monospace; font-size: 13px; > .initial  flex: initial; > .auto  flex: auto; > .none  flex: none; > .four  flex: 4; > .two  flex: 2; > .one  flex: 1; > 

    By default flex items don’t shrink below their minimum content size. To change this, set the item’s min-width or min-height .

    Formal definition

    • flex-grow : 0
    • flex-shrink : 1
    • flex-basis : auto
    • flex-grow : as specified
    • flex-shrink : as specified
    • flex-basis : as specified, but with relative lengths converted into absolute lengths
    • flex-grow : a number
    • flex-shrink : a number
    • flex-basis : a length, percentage or calc();

    Formal syntax

    Examples

    Setting flex: auto

    This example shows how a flex item with flex: auto grows to absorb any free space in the container.

    HTML

    div id="flex-container"> div id="flex-auto">flex: auto (click to toggle raw box)div> div id="flex-initial">flex: initialdiv> div> 

    CSS

    #flex-container  display: flex; font-family: Consolas, Arial, sans-serif; > #flex-container > div  padding: 1rem; > #flex-auto  flex: auto; border: 1px solid #f00; > #flex-initial  border: 1px solid #000; > 

    JavaScript

    const flexAuto = document.getElementById("flex-auto"); const flexInitial = document.getElementById("flex-initial"); flexAuto.addEventListener("click", () =>  flexInitial.style.display = flexInitial.style.display === "none" ? "block" : "none"; >); 

    Result

    The flex container contains two flex items:

    The «flex: initial» item takes up as much space as its width requires, but does not expand to take up any more space. All the remaining space is taken up by «flex: auto».

    When you click «flex: auto», we set «flex: initial»‘s display property to none , removing it from the layout. The «flex: auto» item then expands to occupy all the available space in the container.

    Specifications

    Browser compatibility

    BCD tables only load in the browser

    See also

    Found a content problem with this page?

    This page was last modified on Jul 17, 2023 by MDN contributors.

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