Mary Rose Elbambo

BlockGlow adds a “BlockGlow — Custom CSS” panel to the inspector of every block. Use it to scope custom CSS to a single block instance. The plugin stores CSS in the uploads folder (under uploads/blockglow/) and enqueues the generated CSS file when rendering on the front end. If the uploads directory isn’t writable or file write fails, BlockGlow will fall back to outputting inline styles.
Key features:
<ul>
<li>Adds two block attributes to every block: <code>blockglowCustomCSS</code> and <code>blockglowId</code>.</li>
<li>Inspector panel with a CodeMirror-backed code editor (if WordPress provides it) or a fallback textarea supporting Tab and Shift+Tab outdent.</li>
<li>Live preview inside the block editor: custom CSS is scoped to the block in the editor so you can see the effect while editing.</li>
<li>CSS files are saved to <code>wp-content/uploads/blockglow/blockglow-<id>.css</code> and enqueued on the front end as a linked stylesheet; files are removed automatically when you clear the Custom CSS field.</li>
<li>Graceful fallback to inline styles when file writing isn’t possible.</li>
</ul>
How scoping works:
BlockGlow creates a unique <code>blockglowId</code> for each block instance and scopes your CSS with a wrapper selector like:
<pre><code>[data-blockglow-id="bg-xxxxxxx"] { /* your declarations */ }
</code></pre>
For convenience you can use <code>&</code> as the wrapper shorthand in the editor. Example:
<pre><code>& .my-class { color: red; }
</code></pre>
The plugin will replace <code>&</code> with the wrapper selector for both editor preview and front-end output.
<h3>Support</h3>
If you find issues or want improvements (for example: limiting who can edit per-block CSS, collecting styles into a single head include, or adding an admin UI to manage generated CSS files), open an issue in the repository or reply here and I will assist.

BlockGlow — Per-block Custom CSS

Adds a "Custom CSS" inspector panel to every Gutenberg block and saves per-block CSS files to uploads for front-end enqueuing.

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

BlockGlow — Per-block Custom CSS vs Instant CSS