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.

SilkyPress

Customize your WordPress site’s appearance by easily adding custom CSS and JS code without even having to modify your theme or plugin files. This is perfect for adding custom CSS tweaks to your site.
<h4>Features</h4>
<ul>
<li>Text editor with syntax highlighting </li>
<li>Print the code inline or included into an external file</li>
<li>Print the code in the header or the footer</li>
<li>Add CSS or JS to the frontend or the admin side</li>
<li>Add as many codes as you want</li>
<li>Keep your changes also when you change the theme</li>
</ul>

Simple Custom CSS and JS


When saving CSS as external file, I'm disappointed that you can't name the css file, you can change the permalink and then a duplicate CSS file is created with the name but it is still not used by this plugin.It is much better than Jetpack's version which is horrible.



I have now stopped using it as it also forces you to load the CSS where I needed to conditionally include it, I am now using a text editor, FTP, and wp_enqueue_style() in a child functions.php.  Much easier (at least after working it out), the below code added before the html header started (not sure if that matters):



//===========================================================================
function CompanyHeaderAssets()
//===========================================================================
{
    //--- Main Company CSS ------------------------------------------------
    $CssDir  = '/wp-content/themes/oceanwp-child-theme-master/';
    $CssName = 'Company CSS for Dynamic Pages.css';
    wp_enqueue_style("CompanyCss4All", "{$CssDir}{$CssName}", '', time());

    //--- Main Company CSS 4 ADMINS ---------------------------------------
    if  (IsCompanyVolunteer())
    {
        //--- Not displaying to visitors ------------------------------------
        $CssName = 'Company CSS for Image Gallery Metadata Tooltips (Volunteers Only).css';
        wp_enqueue_style("CompanyCss4StaffOnly4ImageMetadata", "{$CssDir}{$CssName}", '', time());
    }
}
add_action( 'wp_enqueue_scripts', 'CompanyHeaderAssets' );


Good Except Can't Name Files (4567.css etc)


This is a nice handy plugin, but it seems to not load CSS on Elementor pages for some reason. Otherwise nice plugin.


Handy plugin but...


This plugin does flush all permalinks settings on install, without confirmation of Admin, which impacted the whole permalinks settings, and required me to deactivate and reactivate multiple plugins to get their permalinks settings setup again, which is loss of time and requires a clear confirmation before doing that on install.


Impacted the permalinks

Just what I was looking for

Easily add Custom CSS or JS to your website with an awesome editor.

Legacy Jetpack Custom CSS Editor vs Simple Custom CSS and JS