The grid-template-columns property sets the number and width of columns. Defaults to none, no columns are created.
The number of attribute values is the number of columns, and each attribute value is the column width.
For example, if the property value is 100px 50% auto, 3 columns are created, the width of column 1 is 100px, the width of column 2 is 50%, and the width of column 3 is all remaining space.

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CSS / Grid / grid-template-columns, grid-template-rows
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