A simple implicit grid layout
We've explicitly defined three columns for this grid using grid-template-columns: 25rem 40rem 25rem and two rows using grid-template-rows: 25rem 15rem;. But our grid container has eight children. These remaining items are still added to the grid, but the number of rows are implied. The explicitly defined grid columns, and the implied grid rows create an implicit grid. Note that the height of the implicit grid items is auto.
Related specification: CSS Grid Layout Module Level 1.
Grid item A
Grid item B
Grid item C
Grid item D
Grid item E
Grid item F
Grid item G
Grid item H