generatepress-excerpt

add_filter( 'wp_trim_excerpt', 'tu_excerpt_metabox_more' );
function tu_excerpt_metabox_more( $excerpt ) {
    $output = $excerpt;

    if ( has_excerpt() ) {
        $output = sprintf( '%1$s <p class="read-more-button-container"><a class="read-more button" href="%2$s">%3$s</a></p>',
            $excerpt,
            get_permalink(),
            __( 'Read more →', 'generatepress' )
        );
    }
	
    return $output;
}