Ensure it's mobile friendly, but ensure accessibility as well, make it PWA

[bar-alex]

• verify and fix the responsiveness of the layout to work best on mobile, because that's the best use case for the app
• experiment and change the layout to the grid - sounds like a better option for this type of UI
• check the styles on the buttons, they are missing something on click/press
• make sure all work with the keyboard as well
• make it PWA and make it fast (lazy load stuff if necessary), also make it installable
• experiment with adding the PWA to google play store