Is using the height and width properties set in pixels a good practice in terms of responsive layout?

Question

HTML

Guys, I'm making up my first template. Tell me, is it bad practice to use the height and width attributes and set their values ​​​​in pixels (in particular, for the section tag)? For me, this is the simplest and most obvious solution to many of my problems, but I do not use these properties, because I am afraid that my layout will spread on, say, a mobile phone screen.

Answer 1

I use rem, it's easier to scale
css-tricks.com/rems-ems