Slot machines used to be these huge cabinets, sometimes over 40 inches tall,...

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

Slot machines used to be these huge cabinets, sometimes over 40 inches tall, taking up a big chunk of casino floor space. Now, you can play similar games on screens as small as 6 inches wide—right on your phone