RFS
Automates responsive resizing
RFS is a unit resizing engine which was initially developed to resize font sizes (hence its abbreviation for Responsive Font Sizes). Nowadays RFS is capable of rescaling basically every value for any CSS property with units, like margin, padding, border radius or even box-shadow. The mechanism automatically calculates the appropriate values based on the dimensions of the browser viewport. It's available in one of your favorite preprocessors or postprocessor, Sass, Less, Stylus or PostCSS....