$ sudo npm install postcss-csso
$ sudo npm install -g postcss-csso

If want to update the postcss-csso package execute the command as below,

$ sudo npm update postcss-csso

Update package globally,

$ npm install -g postcss-csso

Git clone:

$ sudo  git clone https://github.com/rektide/postcss-csso.git

$ sudo  npm install -g ./postcss-csso

postcss-csso@3.0.0 /usr/lib/node_modules/postcss-csso

How to remove postcss-csso package :

You can uninstall or remove this package from your node_modules run the command as below,

$ sudo npm uninstall postcss-csso

Basic Information of postcss-csso NPM Package: