grid-auto-columns
Quick Summary for grid-auto-columns
The grid-auto-columns CSS property specifies the size of an implicitly-created grid column track or pattern of tracks.
Code Usage for grid-auto-columns
/* Keyword values */ grid-auto-columns: min-content; grid-auto-columns: max-content; grid-auto-columns: auto;  /* <length> values */ grid-auto-columns: 100px; grid-auto-columns: 20cm; grid-auto-columns: 50vmax;  /* <percentage> values */ grid-auto-columns: 10%; grid-auto-columns: 33.3%;  /* <flex> values */ grid-auto-columns: 0.5fr; grid-auto-columns: 3fr;  /* minmax() values */ grid-auto-columns: minmax(100px, auto); grid-auto-columns: minmax(max-content, 2fr); grid-auto-columns: minmax(20%, 80vmax);  /* fit-content() values */ grid-auto-columns: fit-content(400px); grid-auto-columns: fit-content(5cm); grid-auto-columns: fit-content(20%);  /* multiple track-size values */ grid-auto-columns: min-content max-content auto; grid-auto-columns: 100px 150px 390px; grid-auto-columns: 10% 33.3%; grid-auto-columns: 0.5fr 3fr 1fr; grid-auto-columns: minmax(100px, auto) minmax(max-content, 2fr) minmax(20%, 80vmax); grid-auto-columns: 100px minmax(100px, auto) 10% 0.5fr fit-content(400px);  /* Global values */ grid-auto-columns: inherit; grid-auto-columns: initial; grid-auto-columns: revert; grid-auto-columns: unset; 
More Details for grid-auto-columns

grid-auto-columns

The grid-auto-columns CSS property specifies the size of an implicitly-created grid column track or pattern of tracks.

If a grid item is positioned into a column that is not explicitly sized by grid-template-columns, implicit grid tracks are created to hold it. This can happen either by explicitly positioning into a column that is out of range, or by the auto-placement algorithm creating additional columns.

Syntax

/* Keyword values */ grid-auto-columns: min-content; grid-auto-columns: max-content; grid-auto-columns: auto;  /* <length> values */ grid-auto-columns: 100px; grid-auto-columns: 20cm; grid-auto-columns: 50vmax;  /* <percentage> values */ grid-auto-columns: 10%; grid-auto-columns: 33.3%;  /* <flex> values */ grid-auto-columns: 0.5fr; grid-auto-columns: 3fr;  /* minmax() values */ grid-auto-columns: minmax(100px, auto); grid-auto-columns: minmax(max-content, 2fr); grid-auto-columns: minmax(20%, 80vmax);  /* fit-content() values */ grid-auto-columns: fit-content(400px); grid-auto-columns: fit-content(5cm); grid-auto-columns: fit-content(20%);  /* multiple track-size values */ grid-auto-columns: min-content max-content auto; grid-auto-columns: 100px 150px 390px; grid-auto-columns: 10% 33.3%; grid-auto-columns: 0.5fr 3fr 1fr; grid-auto-columns: minmax(100px, auto) minmax(max-content, 2fr) minmax(20%, 80vmax); grid-auto-columns: 100px minmax(100px, auto) 10% 0.5fr fit-content(400px);  /* Global values */ grid-auto-columns: inherit; grid-auto-columns: initial; grid-auto-columns: revert; grid-auto-columns: unset; 

Values

<length>

Is a non-negative length.

<percentage>

Is a non-negative <percentage> value relative to the block size of the grid container. If the block size of the grid container is indefinite, the percentage value is treated like auto.

<flex>

Is a non-negative dimension with the unit fr specifying the track's flex factor. Each <flex>-sized track takes a share of the remaining space in proportion to its flex factor.

When appearing outside a minmax() notation, it implies an automatic minimum (i.e. minmax(auto, <flex>)).

max-content

Is a keyword representing the largest maximal content contribution of the grid items occupying the grid track.

min-content

Is a keyword representing the largest minimal content contribution of the grid items occupying the grid track.

minmax(min, max)

Is a functional notation that defines a size range greater than or equal to min and less than or equal to max. If max is smaller than min, then max is ignored and the function is treated as min. As a maximum, a <flex> value sets the track's flex factor. As a minimum, it is treated as zero (or minimal content, if the grid container is sized under a minimal content constraint).

fit-content( [ <length> | <percentage> ] )

Represents the formula min(max-content, max(auto, argument)), which is calculated similar to auto (i.e. minmax(auto, max-content)), except that the track size is clamped at argument if it is greater than the auto minimum.

auto

Is a keyword that is identical to maximal content if it's a maximum. As a minimum it represents the largest minimum size (as specified by min-width/min-height) of the grid items occupying the grid track.

Note: auto track sizes (and only auto track sizes) can be stretched by the align-content and justify-content properties.

Formal definition

Initial valueauto
Applies togrid containers
Inheritedno
Percentagesrefer to corresponding dimension of the content area
Computed valuethe percentage as specified or the absolute length
Animation typediscrete

Formal syntax

<track-size>+

where <track-size> = <track-breadth> | minmax( <inflexible-breadth> , <track-breadth> ) | fit-content( [ <length> | <percentage> ] )

where <track-breadth> = <length-percentage> | <flex> | min-content | max-content | auto<inflexible-breadth> = <length> | <percentage> | min-content | max-content | auto

where <length-percentage> = <length> | <percentage>

Examples

Setting grid column size

HTML
<div id="grid">   <div id="item1"></div>   <div id="item2"></div>   <div id="item3"></div> </div> 
CSS
#grid {   height: 100px;   display: grid;   grid-template-areas: "a a";   gap: 10px;   grid-auto-columns: 200px; }  #grid > div {   background-color: lime; } 
Result

Specifications

Specification
CSS Grid Layout Module Level 3 # auto-tracks

See also

Related CSS properties: grid-auto-rows, grid-auto-flow, grid Grid Layout Guide: Auto-placement in grid layout - sizing rows in the implicit grid Video tutorial: Introducing Grid auto-placement and order Select your preferred language English (US)EspañolFrançais日本語中文 (简体) Change language

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