These are responsive rectangles. They started as squares due to my window, but they turn as disproportionnated rectangles when you move the window.
Think of this more like this except i need a 10px margin between the 2 squares. And here it sort of works because they are images and i can set their height to auto.
Unfortunately, right now the only types that are supported for proportional scaling are images. I've ensured there's an item in our internal feature tracking database to make this available in a future release, though!
Thank you, hope it comes soon, cause i'll looooove that