Root font-size
Default is 16px. Change this to match your design system or live document.documentElement size.
Rem → Px
—
font-size: —;
Px → Rem
—
font-size: —;
Formulas: px = rem × root · rem = px ÷ root.
Rem is relative to the root element font-size, not the parent. Values round to 4 decimal places for rem and 2 for px.