Sorry for the long delay. I was away for some days and could only work on a few assessments.
Congratulations! All four tasks are correct. 
I have an additional question to the “additional question” 
:
There’s another property beside z-index that works which is more “the Grid way” to do it. Can you find out which one?
See you,
Michael
That’s okay. I know that you are a volunteer. Thanks for you assessment.
I remembered seeing this other property but I had to double check the property name. Now I have updated grid skill test 2 with the answer that I think you are asking for.
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Excellent! That’s right.