rem property
Unit
get
rem
Refers to the CSS rem (root em) unit.
This is used to specify a length relative to the font size of the
root element (usually the <html> element). For example, '2.rem' is equal
to twice the font size of the root element. If all child elements use
rem units, then simply changing the value of the root element will
proportionally adjust the values of the children.
Implementation
Unit get rem => Unit.rem(toDouble());