Custom CSS override preset 'View As' button

Problem

So... Custom CSS is great. I do have an idea to further expand on it. How about when you share a theme you could view the preset in fullscreen like how discord roles let you preview a server seen through using the role eyes, if that makes sense?

Proposed solution

The embed for sharing a theme preset would have a view as button to let you view your screen in that preset until you press escape or a little x somewhere on screen. This way you wouldn't have to manually swap between presets when you want to quickly test loads of different themes you see.