I can never remember this snippet:
display: grid;
grid-template-columns: repeat(auto-fit, minmax(min(100%, 20rem), 1fr));This will create equally sized columns, where 20rem is the minimum width of the columns. When they would become smaller than this, the last entry in a row moves to the next row.
We use min(100%, 20rem) to avoid overflow when the container is smaller than 20rem.