script.js

let menuIcon = document.querySelector('#menu-icon');
let navbar = document.querySelector('.navbar');

menuIcon.onclick = () => {
    menuIcon.classList.toggle('bx-x');
    navbar.classList.toggle('active');
};

let navLinks = document.querySelectorAll('header nav a');


window.onscroll = () => {
    sections.forEach(sec => {
        let top = window.scrollY;
        let offset = sec.offsetTop - 150;
        let height = sec.offsetHeight;
        let id = sec.getAttribute('id');

        if(top >= offset && top < offset +height){
            navLinks.forEach(links =>{
                links.classList.remove('active');
                document.querySelector('header nav a[href*=' + id + ']').classList.add('active');
            });

        };
    });

    let header = document.querySelector('header');

    header.classList.toggle('sticky', window.scrollY > 100);


    menuIcon.classList.remove('bx-x');
    navbar.classList.remove('active');
};