Install libcss-compressor-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libcss-compressor-perl
Description:
Perl extension for CSS minification
CSS::Compressor is an implementation of the CSS parts of Yahoo! YUIcompressor in Perl. It can be used to produce minified CSS on the fly using Perl based backend systems.
Homepage: https://metacpan.org/release/CSS-Compressor/
Version: 0.2-1
Section: universe/perl