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Nick Nish7,304 Points
Hey Jack, did you figure it out? I'm looking at the Codepen and it seems like you achieved the 2 column-layout that degrades to a single-column for smaller screen sizes.
By the way if you ever want to view this on mobile for real don't forget the mobile meta-tag.
<meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
Not sure how to guide you. I don't see a media query to tell the objects to switch their display to full viewport width instead of two columns (45%). Maybe you start there?