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CSS grid-auto-columns Property

The grid-auto-columns property specifies the size for the columns in a grid container.

Initial Value auto
Applies to Grid containers.
Inherited No.
Animatable Yes. Size of the columns are animatable.
Version CSS Grid Layout Module Level 1
DOM Syntax object.style.gridAutoColumns = "100px";

Syntax

grid-auto-columns: auto | max-content | min-content | length | initial | inherit;

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      .box1 { grid-area: 1 / 1 / 2 / 2; }
      .box2 { grid-area: 1 / 2 / 2 / 3; }
      .box3 { grid-area: 1 / 3 / 2 / 4; }
      .box4 { grid-area: 2 / 1 / 3 / 2; }
      .box5 { grid-area: 2 / 2 / 3 / 3; }
      .box6 { grid-area: 2 / 3 / 3 / 4; }
      .black-box1 { grid-area: 1 / 1 / 2 / 2; }
      .black-box2 { grid-area: 1 / 2 / 2 / 3; }
      .black-box3 { grid-area: 1 / 3 / 2 / 4; }
      .black-box4 { grid-area: 2 / 1 / 3 / 2; }
      .black-box5 { grid-area: 2 / 2 / 3 / 3; }
      .black-box6 { grid-area: 2 / 3 / 3 / 4; }
      .auto-box1 { grid-area: 1 / 1 / 2 / 2; }
      .auto-box2 { grid-area: 1 / 2 / 2 / 3; }
      .auto-box3 { grid-area: 1 / 3 / 2 / 4; }
      .auto-box4 { grid-area: 2 / 1 / 3 / 2; }
      .auto-box5 { grid-area: 2 / 2 / 3 / 3; }
      .auto-box6 { grid-area: 2 / 3 / 3 / 4; }
      .grid-container {
      display: grid;
      grid-auto-columns: 50px;
      grid-gap: 10px;
      background-color: #555;
      padding: 10px;
      }
      .grid-container > div {
      background-color: #ccc;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .black-container {
      display: grid;
      grid-auto-columns: 100px;
      grid-gap: 10px;
      background-color: #000;
      padding: 10px;
      }
      .black-container > div {
      background-color: #ccc;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .auto-container {
      display: grid;
      grid-auto-columns: auto;
      grid-gap: 10px;
      background-color: #ccc;
      padding: 10px;
      }
      .auto-container > div {
      background-color: #999;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
    </style>
  </head>
  <body>
    <h2>Grid-auto-columns property example</h2>
    <h3>50 pixels</h3>
    <div class="grid-container">
      <div class="box1">1</div>
      <div class="box2">2</div>
      <div class="box3">3</div>
      <div class="box4">4</div>
      <div class="box5">5</div>
      <div class="box6">6</div>
    </div>
    <h3>100 pixels</h3>
    <div class="black-container">
      <div class="black-box1">1</div>
      <div class="black-box2">2</div>
      <div class="black-box3">3</div>
      <div class="black-box4">4</div>
      <div class="black-box5">5</div>
      <div class="black-box6">6</div>
    </div>
    <h3>auto</h3>
    <div class="auto-container">
      <div class="auto-box1">1</div>
      <div class="auto-box2">2</div>
      <div class="auto-box3">3</div>
      <div class="auto-box4">4</div>
      <div class="auto-box5">5</div>
      <div class="auto-box6">6</div>
    </div>
  </body>
</html>

Here is an example which contain all the values:

Example

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      .box1 { grid-area: 1 / 1 / 2 / 2; }
      .box2 { grid-area: 1 / 2 / 2 / 3; }
      .box3 { grid-area: 1 / 3 / 2 / 4; }
      .box4 { grid-area: 2 / 1 / 3 / 2; }
      .box5 { grid-area: 2 / 2 / 3 / 3; }
      .box6 { grid-area: 2 / 3 / 3 / 4; }
      .black-box1 { grid-area: 1 / 1 / 2 / 2; }
      .black-box2 { grid-area: 1 / 2 / 2 / 3; }
      .black-box3 { grid-area: 1 / 3 / 2 / 4; }
      .black-box4 { grid-area: 2 / 1 / 3 / 2; }
      .black-box5 { grid-area: 2 / 2 / 3 / 3; }
      .black-box6 { grid-area: 2 / 3 / 3 / 4; }
      .grey-box1 { grid-area: 1 / 1 / 2 / 2; }
      .grey-box2 { grid-area: 1 / 2 / 2 / 3; }
      .grey-box3 { grid-area: 1 / 3 / 2 / 4; }
      .grey-box4 { grid-area: 2 / 1 / 3 / 2; }
      .grey-box5 { grid-area: 2 / 2 / 3 / 3; }
      .grey-box6 { grid-area: 2 / 3 / 3 / 4; }
      .white-box1 { grid-area: 1 / 1 / 2 / 2; }
      .white-box2 { grid-area: 1 / 2 / 2 / 3; }
      .white-box3 { grid-area: 1 / 3 / 2 / 4; }
      .white-box4 { grid-area: 2 / 1 / 3 / 2; }
      .white-box5 { grid-area: 2 / 2 / 3 / 3; }
      .white-box6 { grid-area: 2 / 3 / 3 / 4; }
      .auto-box1 { grid-area: 1 / 1 / 2 / 2; }
      .auto-box2 { grid-area: 1 / 2 / 2 / 3; }
      .auto-box3 { grid-area: 1 / 3 / 2 / 4; }
      .auto-box4 { grid-area: 2 / 1 / 3 / 2; }
      .auto-box5 { grid-area: 2 / 2 / 3 / 3; }
      .auto-box6 { grid-area: 2 / 3 / 3 / 4; }
      .grid-container {
      display: grid;
      grid-auto-columns: 50px;
      grid-gap: 10px;
      background-color: #555;
      padding: 10px;
      }
      .grid-container > div {
      background-color: #ccc;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .black-container {
      display: grid;
      grid-auto-columns: 100px;
      grid-gap: 10px;
      background-color: #000;
      padding: 10px;
      }
      .black-container > div {
      background-color: #ccc;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .grey-container {
      display: grid;
      grid-auto-columns: max-content;
      grid-gap: 10px;
      background-color: #ccc;
      padding: 10px;
      }
      .grey-container > div {
      background-color: #555;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .white-container {
      display: grid;
      grid-auto-columns: min-content;
      grid-gap: 10px;
      background-color: #ccc;
      padding: 10px;
      }
      .white-container > div {
      background-color: #fff;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
      .auto-container {
      display: grid;
      grid-auto-columns: auto;
      grid-gap: 10px;
      background-color: #ccc;
      padding: 10px;
      }
      .auto-container > div {
      background-color: #999;
      text-align: center;
      padding: 20px 0;
      font-size: 30px;
      }
    </style>
  </head>
  <body>
    <h2>Grid-auto-columns property example</h2>
    <p>Use the grid-auto-columns property to set a default size (width) for all columns.</p>
    <h3>50 pixels</h3>
    <div class="grid-container">
      <div class="box1">1</div>
      <div class="box2">2</div>
      <div class="box3">3</div>
      <div class="box4">4</div>
      <div class="box5">5</div>
      <div class="box6">6</div>
    </div>
    <h3>100 pixels</h3>
    <div class="black-container">
      <div class="black-box1">1</div>
      <div class="black-box2">2</div>
      <div class="black-box3">3</div>
      <div class="black-box4">4</div>
      <div class="black-box5">5</div>
      <div class="black-box6">6</div>
    </div>
    <h3>max-content</h3>
    <div class="grey-container">
      <div class="grey-box1">1</div>
      <div class="grey-box2">2</div>
      <div class="grey-box3">3</div>
      <div class="grey-box4">4</div>
      <div class="grey-box5">5</div>
      <div class="grey-box6">6</div>
    </div>
    <h3>min-content</h3>
    <div class="white-container">
      <div class="white-box1">1</div>
      <div class="white-box2">2</div>
      <div class="white-box3">3</div>
      <div class="white-box4">4</div>
      <div class="white-box5">5</div>
      <div class="white-box6">6</div>
    </div>
    <h3>auto</h3>
    <div class="auto-container">
      <div class="auto-box1">1</div>
      <div class="auto-box2">2</div>
      <div class="auto-box3">3</div>
      <div class="auto-box4">4</div>
      <div class="auto-box5">5</div>
      <div class="auto-box6">6</div>
    </div>
  </body>
</html>

Values

Value Description
auto The size of the columns takes up the size of the container. This is the default value of the property.
max-content The size of each column depends on the largest item in the column.
min-content The size of each column depends on the smallest item in the column.
minmax(min.max) The size range is greater than or equal to "min" and less than or equal to "max".
length The size of the columns is specified by length value.
% The size of the columns is specified by percentages.
initial Makes the property use its default value.
inherit Inherits the property from its parents element.

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