Fixing mobiile site to work right and look like pc version

hi so i was having an issue with pinch and zoom out on mobile, i tried changing px to% as well as changed my side spacing to 0 but it is still bugged, my main issue now is throughout the prosses of trying to fix my mobile version i’ve messed everything up.
is there a way to revert or reset mobile to default? any help would be much apretiated