Cannot make grid-container scroll on overflow

I am stumped on what seems like a relatively easy problem: make a grid container scroll when it overflow, specifically in the x direction. However, the container isn't respecting my overflow: scroll. Im stumped.. Codepen below

https://codepen.io/fluffybacon-steam/pen/bGPYyMQ

Solution: It was my MacOs settings. System Setting -> Appearance -> Show Scrollbars (Always)