George Stephanis

This plugin re-adds a standalone editing page for Custom CSS 
in the WordPress Admin UI, for users that aren’t comfortable 
using the one in the Customizer.
Currently it only works with Jetpack and Jetpack’s added features, 
but shortly it will work without Jetpack as well, providing a 
more basic text editor without syntax highlighting.

Legacy Jetpack Custom CSS Editor

I was utterly dismayed to see the old Jetpack CSS editor disappear in favor of a little customizer box in WP 4.7. Thank you so much for restoring the legacy editor where we can actually see what we're working with, and where our designer can work with CSS without having to upload style.css every time they make a change. It's a vital part of our workflow and the little box in the customizer is completely inadequate.

many thanks for this lifesaver

This plugin re-adds the full page admin Custom CSS editor to Jetpack.

dylanblokhuis

Use the power of Visual Studio Code in WordPress to write your CSS or SCSS
The plugin uses autoprefixer to parse your CSS/SCSS into CSS that will work on older browsers, no need to write -webkit, -moz or -o.
You can also choose to use SCSS, more info about SCSS here: https://sass-lang.com/guide
<h4>Features</h4>
<ul>
<li>Use all the powerful features from Visual Studio Code</li>
<li>Your CSS gets compiled with autoprefixer to work on older browsers</li>
<li>Use SCSS to create efficient stylesheets with variables, mixins, etc.</li>
<li>Option to minify your CSS to reduce loading times</li>
<li>No refreshing on saving</li>
<li>Live editor updating styles on save and have the browser update simultaneously</li>
</ul>

Instant CSS

I do not often write reviews but I had to !
Your plugin is just awesome ! I can write SCSS directly, there's a live editor... What else ?
Amazing job ! I can not recommend more a plugin then this one.

Finally! A CSS plugin that supports SCSS

Write your styles beautifully with the power of Visual Studio Code

Legacy Jetpack Custom CSS Editor vs Instant CSS