Slot machines used to be huge, bulky cabinets that took up 40+ inches of casino...

https://varimail.com/articles/what-is-responsive-design-in-a-mobile-slot-game/

Slot machines used to be huge, bulky cabinets that took up 40+ inches of casino floor space. Now, many games fit comfortably on screens as small as 6-7 inches, right in your pocket