The column-width CSS property sets the ideal column width in a multi-column layout. The container will have as many columns as can fit without any of them having a width less than the column-width value. If the width of the container is narrower than the specified value, the single column's width will be smaller than the declared column width.

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This property can help you create responsive designs that fit different screen sizes. Especially in the presence of the column-count property (which has precedence), you must specify all related length values to achieve an exact column width. In horizontal text these are width, column-width, column-gap, and column-rule-width.


/* Keyword value */
column-width: auto;

/* <length> values */
column-width: 60px;
column-width: 15.5em;
column-width: 3.3vw;

/* Global values */
column-width: inherit;
column-width: initial;
column-width: revert;
column-width: revert-layer;
column-width: unset;

The column-width property is specified as one of the values listed below.



Indicates the optimal column width. The actual column width may differ from the specified value: it may be wider when necessary to fill available space, and narrower when the available space is too small. The value must be strictly positive or the declaration is invalid. Percentage values are also invalid.


The width of the column is determined by other CSS properties, such as column-count.

Formal definition

Initial valueauto
Applies toBlock containers except table wrapper boxes
Computed valuethe absolute length, zero or larger
Animation typea length

Formal syntax

column-width = 
auto |
<length [0,∞]> |
min-content |
max-content |
fit-content( <length-percentage> )

<length-percentage> =
<length> |


Setting column width in pixels


<p class="content-box">
  Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy
  nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi
  enim ad minim veniam, quis nostrud exercitation ullamcorper suscipit lobortis
  nisl ut aliquip ex ea commodo consequat.


.content-box {
  column-width: 100px;



CSS Box Sizing Module Level 3
# column-sizing
CSS Multi-column Layout Module Level 1
# cw

Browser compatibility

BCD tables only load in the browser

See also