This Sass mixin allows you to create fluid font sizes that will scale responsively based on the viewport width. It takes two arguments:
- Min font size: The minimum font size in pixels.
- Max font size: The maximum font size in pixels.
- (optional) Min viewport width: The minimum viewport width in pixels.
- (optional) Max viewport width: The maximum viewport width in pixels.
The mixin will then calculate a fluid font size that falls within that range, based on the current viewport width.