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How to force all grid children to be constrained by grid size?

I’m trying to display many powerpoint slide images that you just scroll down to see one by one, with a margin in between. No cropping whatsoever. I’m trying to avoid styling every single image, so I thought I could use a grid to automatically force the size of all its children. But I can’t seem to make the images fit the grid, they just keep overflowing. Unless I manually style all the children to width 100%, which kind of defeats the purpose.

Please help, what’s the easiest way to do this?