Should I use pixels or Rems and ems

Should I use pixels or Rems and ems
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#1

I’ve done some reading on this topic and some articles recommend using Rems for the layout of your page and ems for the font size, But when I did a free day at a company they all used pixels and I was told pixels are coming back now that browsers use zoom. So my question is should I use Rems and ems for just use pixels?