Mobile-first design means creating apps and websites primarily for phones and...

https://victoriasmasterchat.yousher.com/why-do-mobile-users-miss-buttons-even-when-they-are-on-the-screen

Mobile-first design means creating apps and websites primarily for phones and tablets. It focuses on speed, so pages load quickly even on small screens. Buttons and menus are big and easy to tap, making navigation simple