Grid width and height

Hello guys,
after several hours of trying to archive the height and the width of a grid to screen size I am helpless.
The grid is always expanding to the full width and height no matter what.
The only thing I could handle the width and height was by e.g Style="height: 500px".
Things like height: 100vh or height: 20% didn't work and the grid kinda ignores it.
There has to be a better way than just raw 500px.
How do you handle the width and height of a grid?
As always thank you for your help!

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