The column-gap CSS property sets the size of the gap (gutter) between an element's columns.

Initially a part of Multi-column Layout, the definition of column-gap has been broadened to include multiple layout methods. Now specified in CSS box alignment, it may be used in multi-column, flexible box, and grid layouts.

Early versions of the specification called this property grid-column-gap, and to maintain compatibility with legacy websites, browsers will still accept grid-column-gap as an alias for column-gap.

Try it

column-gap: 0;

column-gap: 10%;

column-gap: 1em;

column-gap: 20px;

<section class="default-example" id="default-example">
  <div class="example-container">
    <div class="transition-all" id="example-element">
      <div>One</div>
      <div>Two</div>
      <div>Three</div>
      <div>Four</div>
      <div>Five</div>
    </div>
  </div>
</section>

#example-element {
  border: 1px solid #c5c5c5;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 200px;
}

#example-element > div {
  background-color: rgb(0 0 255 / 0.2);
  border: 3px solid blue;
}

Syntax

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

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

/* <percentage> value */
column-gap: 3%;

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

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

Values

normal

The browser's default spacing is used between columns. For multi-column layout this is specified as 1em. For all other layout types it is 0.

<length>

The size of the gap between columns, defined as a <length>. The <length> property's value must be non-negative.

<percentage>

The size of the gap between columns, defined as a <percentage>. The <percentage> property's value must be non-negative.

Formal definition

Formal syntax

column-gap = 
  normal                     |
  <length-percentage [0,∞]>  

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

Examples

Flex layout

In this example, a flex container contains six flex items of two different widths (200px and 300px), creating flex items that are not laid out as a grid. The column-gap property is used to add horizontal space between the adjacent flex items.

HTML

<div class="flexbox">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

CSS

To create a flex container, we set its display property value to flex. We then use the flex-flow shorthand property to set the flex-direction to row (the default) and flex-wrap to wrap, allowing the flex items to flow onto new lines if needed. By default, flex items stretch to be as tall as their container. By setting a height, even the empty flex items will be 100px tall.

To better demonstrate the column-gap property, the flex items in this example have two different width values. The width of the flex items is set within the <div> flex items. We use the flex-basis component of the flex shorthand property to make all the flex items 200px wide. We then target every third flex item by using the :nth-of-type(3n) selector, widening them to 300px.

The column-gap value is set as 20px on the flex container to create a 20px gap between the adjacent flex items in each row.

.flexbox {
  display: flex;
  flex-flow: row wrap;
  height: 100px;
  column-gap: 20px;
}

.flexbox > div {
  border: 1px solid green;
  background-color: lime;
  flex: 200px;
}
div:nth-of-type(3n) {
  flex: 300px;
}

Result

Grid layout

HTML

<div id="grid">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

CSS

#grid {
  display: grid;
  height: 100px;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: 100px;
  column-gap: 20px;
}

#grid > div {
  border: 1px solid green;
  background-color: lime;
}

Result

Multi-column layout

HTML

<p class="content-box">
  This is some multi-column text with a 40px column gap created with the CSS
  `column-gap` property. Don't you think that's fun and exciting? I sure do!
</p>

CSS

.content-box {
  column-count: 3;
  column-gap: 40px;
}

Result

Specifications

Browser compatibility

See also

• row-gap
• gap
• Basic concepts of grid layout: gutters
• Styling Columns