Mobile-First approach with CSS grid

What are you most proud of, and what would you do differently next time?

I'm really proud of figuring out how to calculate the height of my main container. Which I would normally set as 100vh, but considering the small footer place outside there was a bit of overflow. Using a bit of JavaScript and document selectors, I was able to dynamically calculate the height of the div I wanted to subtract from the total height (100vh).