The column-gap CSS property sets the size of the gap between columns for elements which are specified to be displayed as multi-column elements.

Initial valuenormal
Applies tomulticol elements
Computed valuethe absolute length or the keyword normal
Animation typea length
Canonical orderthe unique non-ambiguous order defined by the formal grammar


/* Keyword value */
column-gap: normal; 

/* <length> values */
column-gap: 3px;
column-gap: 2.5em;

/* Global values */
column-gap: inherit;
column-gap: initial;
column-gap: unset;


Is a keyword indicating to use the browser-defined default spacing between columns. The specification, which most modern browsers follow, recommends that this be equal to a length of 1em.
Is a <length> value defining the size of the gap between columns. It must not be negative, but may be equal to 0.

Formal syntax

<length> | normal


.content-box {
  border: 10px solid #000000;
  column-count: 3;
  column-gap: 20px;


Specification Status Comment
CSS Multi-column Layout Module
The definition of 'column-gap' in that specification.
Candidate Recommendation Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes)-webkit
1.5 (1.8)-moz[1]
52 (52)[3]
10 11.10 3.0 (522)-webkit
Feature Android Android Webview Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile Chrome for Android
Basic support ? ?
52.0 (52)[3]
? ? ? ?

[1] Before Firefox 3 (Gecko 1.9), the default value associated to the normal keyword was 0 and not 1em.

[2]  Unprefixed as of Chrome 50.

[3] Unprefixed as of Gecko 52, with prefixed aliases still available.

See also