Hi Yanay
Many thanks for your respond. Unfortunately I still do something wrong, as I can’t get it to work with the gaps being consistent when I strech the screen to a wider size. As soon as I strech the screen to a wider size, the images overlap, although I have set the gridsize to a minimum vh. I have different rows, it only works with two rows where the images of the top row are docked to the bottom of the gridline and the images of the bottom row are docked to the top of the gridlide. This obviosly won’t work as the rows continue… Maybe it’s something I set up wrong in the grid, I don’t know…
Here are some screenshots again of what I’m doing with the hope, that you can help me. 
Many thanks anyways!
Best, Nadine