function two_bro_setup_sidebars() {
$args = array(
    'name' => 'Sidebar right',
    'id' => 'sidebar-right',
    'before_widget' => '<section class="panel">',
    'after_widget' => '</section>',
    'before_title' => '<h3>',
    'after_title' => '</h3>'
);
register_sidebar($args);
}
add_action( 'widgets_init', 'two_bro_setup_sidebars' )

<?php if ( !is_active_sidebar( 'sidebar-right' ) ) : 
    dynamic_sidebar( 'sidebar-right' );
endif; ?>