v4: Can't set $font-size-base to a pixel value

Created by: Jakobud

Currently, $font-size-base is defined as:

$font-size-base: 1rem !default;

If you attempt to define your base font size using pixels, for example:

$font-size-base: 14px;

Then SASS will not compile because of Incompatible units: 'rem' and 'px'. in various calculations. It seems like you should be able to define a font size using pixels. If you are working with a designer who is using Sketch or something, you can sure bet that they have their font's defined in pixels. A designer is not going to have any clue what a rem is.