You can layer items in the Grid, using z-index to control the order that they stack. In this example I have boxes arranged on a grid, my box F is last in the source order and positioned on the Grid so it partly overlaps box D.

Without any z-index property it will display on top of box D. However I can add a z-index and control the position which works as you would expect if you have used the z-index property with positioned elements.

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