Suzanne

This plugin adds a metabox to all post and page edit screens ( and optionally to 
custom post type edit screens ) that allows the user specify custom CSS for that 
page or post. All it does is wrap your CSS in tags 
and then inserts the block into the section of your page/post. Pretty simple.

Custom CSS for Pages and Posts

This plugin adds a metabox to all post and page edit screens ( and optionally to

Need to add some custom CSS to your site? Simple CSS gives you an awesome admin editor and a live preview editor in the Customizer so you can easily add your CSS.
Want your CSS to only apply on a specific page or post? Simple CSS adds a metabox which allows you to do just that.
Check out GeneratePress, our awesome WordPress theme! (https://wordpress.org/themes/generatepress)
<h4>Features include:</h4>
<ul>
<li>Full featured admin CSS editor</li>
<li>Dark and light editor themes</li>
<li>CSS editor in the Customizer so you can live preview your changes</li>
<li>Metabox for page/post specific CSS</li>
</ul>

Simple CSS

Add CSS to your website through an admin editor, the Customizer or a metabox for page/post specific CSS.

Custom CSS for Pages and Posts vs Simple CSS