How do I make a grid container align it's children to the center

I’m trying to create an inventory with a grid container and I want the children of the grid container to be aligned to the center of it rather than to the top left.
Is there a setting that can do this or is there something more I need to do?
Thanks in advance

Set the children Container Sizing Vertical and Horizontal to Shrink Center and Expand the children need to have a Custom Minimum Size assigned for this to work

Thanks!