How can I make the nav bar fill out to the screen of any device just like the nav bar on sololearn app

Question

The nav bar carrying the home, learn and quiz icons
https://code.sololearn.com/W4s2dAYnBryr/?ref=app

Answer 1

It's simple bro use
display:fix;
Property of css to fix your div tag . It will be fixed at it's own position even if the screen is scrolled.