Adële on Nostr: npub1zylk3…ct54n OK So, if I do not set a font-size for the body nor the html tags, ...

npub1zylk3x2cvl79r854gtnqjvh7cjns6zzynvf39llvfvh6gl89cgvslct54n (npub1zyl…t54n) OK

So, if I do not set a font-size for the body nor the html tags, what about the Hn tags? Is it a good idea to use a relative size to the root element as this:
html { }
body { }
h1 {font-size: 2rem;}
h2 {font-size: 1.6rem;}
h3 {font-size: 1.2rem;}