This plugin will help you to add your own custom CSS in the AMP version. You need to have atleast one AMP plugin on your website to make this custom CSS work.

AMP for WP is the most recommended AMP plugin by the community. Automatically add Accelerated Mobile Pages (Google AMP Project) functionality on your WordPress site.

This plugin will help you to add easy table of contents in the AMP version. its fully compatible with Official AMP Plugin and AMP for WP Plugin