add_action( 'wp_enqueue_scripts', function() {

  // Code & check below enqueues your files on the canvas & frontend, not the builder panel. Otherwise custom CSS might affect builder)

  if ( ! bricks_is_builder_main() ) {

    wp_enqueue_style( 'bricks-child', get_stylesheet_uri(), ['bricks-frontend'], filemtime( get_stylesheet_directory() . '/style.css' ) );

  }

} );