Fluid Typography

Pronto provides a sass function fluid-rems() for quickly defining fluid typography sizes based on the breakpoints:

fluid-rems($size-sm, $size-lg)
fluid-rems($size-sm, $size-md, $size-lg)

fluid-rems() can take either two or three arguments, where $size-sm specifies the size at the sm breakpoint, $size-md at md, and $size-lg at lg.

Pronto's heading are fluid by default: