An element with display: grid can define its grid-template-columns based on (preferred) child width using the repeat function with auto-fill or auto-fit, like so:

grid-template-columns: repeat(auto-fit, 100px)

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auto-fill and auto-fit behave differently if you use rules with dynamic sizing, like minmax(100px, 1fr). Simply put, auto-fill will create as many columns as possible, including empty ones, while auto-fit hides empty columns.

See the linked page for more details.