Show breakpoint in browser

[Blocs_User]

@KBConcepts I think your addition forgets Blocs stance, choosing not to support Bootstraps official XL and XXL breakpoints.

https://forum.blocsapp.com/t/the-xl-breakpoint-dun-dun-duuuun/6182

https://forum.blocsapp.com/t/xxl-breakpoint/23294/2