Mobile-first design means creating apps and websites that work smoothly on your...

https://wiki-velo.win/index.php/Why_Does_My_Website_Look_Fine_on_Desktop_but_Messy_on_My_Phone%3F

Mobile-first design means creating apps and websites that work smoothly on your phone first. It’s all about speed, easy-to-tap buttons, and simple navigation that helps you find what you need without extra hassle