Grid with auto-fill and minmax

This snippet was taken from some old posts on CSS Tricks:

• https://css-tricks.com/newsletter/276-future-friendly-layouts-and-design-system-vitals/
• https://css-tricks.com/auto-sizing-columns-css-grid-auto-fill-vs-auto-fit/

grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));