Taro Lead Next

Default stylesheet is registered as tsln-lead-block in init hook at the priority 20.
For full customization, register your style as a same name. The style registered faster priors to plugin’s style.

add_action( 'init', function() {
    wp_register_style( 'tsln-lead-block', 'your-theme/original.css', [], '1.0.0' );
}, 10 );

Header

Default header title is “Next Page”. We have a plan to make it customizable from Theme Customizer, but you can change it by filter hook for the present.

add_filter( 'tsln_next_page_default_title', function( $title ) {
    return "What's Next?";
} );