html { font-size: 62.5% 87.5% 100% 112.5% 150% 200% 24px 2em }    body { font-size: 62.5% 87.5% 100% 112.5% 150% 200% 24px 2em }

[px] font-size:16px

[pt] font-size:12pt (16px)

[%] font-size:100% (16 px)

[em] font-size:1em (16 px)

[rem] font-size:1rem (16 px)