Slot machines used to fill casino floors with massive cabinets over 50 feet...

https://future-wiki.win/index.php/What_Is_Responsive_Design_in_a_Mobile_Slot_Game%3F

Slot machines used to fill casino floors with massive cabinets over 50 feet tall creating a loud, flashy atmosphere. Now you can play similar games on a 6-inch screen right in your pocket