Solutionunvalidated
use no gap on your grid, but add a border to the grid-items and add an inner wrapper — This way the whole grid just uses one background-image. Tension: the gaps between them remain transparent. Outcome: add a border to the grid-items and add an inner wrapper to make the border-radius.
fabf4e40-1b01-43f8-b8ba-19e251b96fd5
use no gap on your grid, but add a border to the grid-items and add an inner wrapper — This way the whole grid just uses one background-image. Tension: the gaps between them remain transparent. Outcome: add a border to the grid-items and add an inner wrapper to make the border-radius.