1 inch  = 2,54cm  = 96px = 72pt = 6pc

18px,16px,1rem,14px : XX X X   so 1rem = 16px

s10rem 10rem 10rem 10rem 10rem
100px 100px 100px 100px 100px 100px 100px 100px
1cm 1cm 1cm 1cm 1cm 1cm 1cm 1cm