Register new widget areas

Hi. I try to register new widget areas in my quark-child theme. Thats how my functions.php looks:

<?php
function quark-child_widgets_init() {
        register_sidebar( array(
                        'name' => esc_html__( 'startseite', 'quark-child' ),
                        'id' => 'startseite',
                        'description' => esc_html__( 'Auf der Startseite rechts', 'quark-child' ),
                        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
                        'after_widget' => '</aside>',
                        'before_title' => '<span class="schriftgross">',
                        'after_title' => '</span>'
                ) );
}
add_action( 'widgets_init', 'quark-child_widgets_init' );
?>

It’s not working 🙂

I am a beginner in php. i checked the wordpress codex an more than one description about how do to that. No success.

It would be great if someone could help me.

I put the functions.php file in my quark-child folder