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  3. How to Add Custom CSS to a Specific Block?

How to Add Custom CSS to a Specific Block?

  • Select the accordion block and scroll to the very bottom of the sidebar to find the Advanced panel.
  • Enter a unique class name in the Additional CSS Class(es) field.
  • Go to your WordPress Theme Customizer > Additional CSS and write your custom styles targeting that specific class.
Updated on March 4, 2026