How much of the CSS style that you import from external libraries you really use? Sometimes even less than 20%, so why do you need to have all this unused style? No reason! Purgecss come to help, it is a tool which helps to remove unused CSS and it can be used as part of your development workflow. Post written by Luca Spezzano.
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Stylemug is a fast css-in-js library that extracts atomic CSS rules to a .css file. It generates atomic CSS from the static stylesheets defined in JS. The compiled rules are extracted to a .css file.The stylesheet code in the Javascript bundle is replaced (no CSS in JS) with a hash map for classnames lookup at runtime.
How Do You Remove Unused CSS From a Site?
Here's what I'd like you to know upfront: this is a hard problem. If you've landed here because you're hoping to be pointed at a tool you can run that tells you exactly what CSS you can delete from your project, well... there are tools out there, but I'm warning you to be very careful with them because none of them can ever tell you the complete story. Post written by Chris Coyer.
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Electron
If you can build a website, you can build a desktop app. Electron is a framework for creating native applications with web technologies like JavaScript, HTML, and CSS. It takes care of the hard parts so you can focus on the core of your application.