Tower Theme - Sticky Header Fix

/**
 * Enqueue theme's main script.
 * Hook it in late to make sure any dependencies have been loaded.
 */
function tower_child_enqueue_theme_script() {
    wp_enqueue_script('tower-child', get_stylesheet_directory_uri() . '/assets/js/theme.js', ['jquery'], false, true);

    $header_position = ( is_front_page() ) ? 'absolute' : 'relative';

    /**
     * STICKY HEADER ENFORCEMENT (BUG FIX)
     */
    $custom_js = "
    jQuery(document).ready(function () {
        'use strict';

        //const header = jQuery('#header');
        const header_wrapper = jQuery('.header_wrapper');
        const body = jQuery(document.body);

        window.onscroll = function () {
            var top = window.scrollY;
            if (top >= 120) {
                body.addClass('sticky_header');
                header_wrapper.addClass('open');
                header_wrapper.css({'position': 'fixed', 'visibility': 'visible'});
            }
            else {
                body.removeClass('sticky_header');
                header_wrapper.removeClass('open');
                header_wrapper.css({'position': '{$header_position}', 'visibility': 'visible'});
            }
        }
    });
    ";

    wp_add_inline_script( 'tower-child', $custom_js );
}
add_action('wp_enqueue_scripts', 'tower_child_enqueue_theme_script', 100);