Main — this region is placed with grid-area: main into the 1fr row, so it takes all the height the header and footer leave over.
Compare the CSS with demo 06: no growing children, just three named rows.
Main — this region is placed with grid-area: main into the 1fr row, so it takes all the height the header and footer leave over.
Compare the CSS with demo 06: no growing children, just three named rows.