Download – Email Customizer for WooCommerce v2.31 WordPress plugin
Email Customizer for WooCommerce v2.31 enables full customization of
your WooCommerce emails. Customize colors, header & footer format,
add custom links, link to your social networks, and customize what the
email says – with [shortcodes] – all using the familiar WordPress
Customizer interface. You no longer need to be a developer to do this.
And if you still want to you can add your own custom css too.