npm run build

https://css-tricks.com/a-crash-course-in-wordpress-block-filters/

Block Mods

A WordPress plugin that modifies and extends native Gutenberg Block functionality:

• Adds gradient backgrounds to core/video block
• Adds size selector to core/button block
• Adds column options to core/list block

Installation

• Pull the plugin repo to wp-content/plugins folder of your WordPress site
• Navigate to plugin folder in command line and run npm install && npm run build

Usage Notes

• Plugin only adds classes (as needed). Any necessary styling is left up to the theme.