Published Jul 14, 2021Updated Sep 3, 2021
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A property that specifies the default column size(s) for a container.


.grid-container {
display: grid;
grid-auto-columns: <col-value>;

where <col-value> can be one of the following:

  • Grid keyword: auto, maxcontent, minmax()
  • Pixel value: 300px
  • Percent value: 25%
  • Fractional unit value: 1fr

Example 1

A container divided into evenly spaced columns with a minimum width of 100 pixels:

.content-a-container {
display: grid;
grid-auto-columns: minmax(100px, auto);

Example 2

A container with columns that each constitute 10% of the available width:

.content-b-container {
display: grid;
grid-auto-columns: 10%;

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