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Go Language

Mistake in footer grid-row lines.

I notice in the video the Footer css is written

footer { grid-row: -3 / -1; }

When I preview this it puts the footer to the right of the aside. If I set the value in the footer to 3 / -1 then it looks like the video. I want to understand if this should be -3 and why would it be moving my footer over to the right of the aside.