Nick Halsey

WordPress core provides custom CSS functionality in the customizer that’s specific to the current theme; you can switch themes freely with each theme’s additional CSS remaining in place. This is particularly useful on multisite networks, where it’s often impractical to use child themes to save customizations for each site. Unfortunately, custom CSS is not visible to site admins on multisite networks by default because they are not trusted with unfiltered CSS.
This plugin gives site admins access to the core custom CSS feature by mapping the <code>edit_css</code> capability to <code>edit_theme_options</code>, thereby trusting site admins with unfiltered CSS.

Multisite Custom CSS

Just as much code as it needs :)

Perfect

Nice!!!

WordPress core provides custom CSS functionality in the customizer that's specific to the current theme; you can switch themes freely with each t …

Pektsekye

This plugin requires <a href="https://wordpress.org/plugins/product-options-for-woocommerce/" rel="ugc">Simple Product Options for WooCommerce</a> plugin.
Allows to add custom CSS classes to product options. So you can apply specific style for certain product option or option value. 
Also another plugin or custom JS script can find that specific product option by CSS class.
You can check a demo on this page: 
<a href="http://hottons.com/demo/wp/ef/product/option-css/" rel="nofollow ugc">DEMO Page</a>
You can read the installation instructions here: 
<a href="http://hottons.com/demo/wp/ocss/README.html" rel="nofollow ugc">README</a>
Simple Code Idea:
The idea of this plugin is to keep the base version as simple as possible. 
And to add the new features as modifications.
This plugin has just 17 files to make it easy to use and customize. If you need more features check the modifications page <a href="http://hottons.com/ocss_modifications" rel="nofollow ugc">hottons.com/ocss_modifications</a>
Contact me by email <a href="mailto:pektsekye@gmail.com" rel="nofollow ugc">pektsekye@gmail.com</a> if you have questions or need help.
<h3>Translators</h3>
<h4>Available Languages</h4>
<ul>
<li>English (Default)</li>
</ul>
<h3>Documentation</h3>
Full documentation is available <a href="http://hottons.com/demo/wp/ocss/README.html" rel="nofollow ugc">here</a>.

POFW Option CSS

Adds custom CSS classes to product options of the "Product Options for WooCommerce" plugin.

Multisite Custom CSS vs POFW Option CSS