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function coaching_admin_styles(){
    global $typenow;
    if( $typenow == 'coaching_os' ) {
        wp_enqueue_style( 'coaching_meta_box_styles', RLT_THEME_CSS_URI . '/meta-box-styles.css' );
    }
}
add_action( 'admin_print_styles', 'coaching_admin_styles' );