Dark CSS

Scrollspy Navigation using Html CSS & JavaScript

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					<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Kodofy | Modern Scroll Spy</title>
    
    
</head>

<body>

    <header>
        <div class="logo">Kodofy</div>
        <nav>
            <a href="#home" class="active">Home</a>
            <a href="#workflow">Workflow</a>
            <a href="#docs">Docs</a>
            <a href="#about">About</a>
        </nav>
    </header>

    <main>
        <section id="home">
            <h2>Introduction</h2>
            <p>Lorem ipsum dolor sit, amet consectetur adipisicing elit. Harum odit placeat pariatur reiciendis ratione
                aliquid atque ut officiis et. Nihil.</p>
            <p>Autem magni non quia perspiciatis laudantium dolorum id, iure qui esse rerum accusamus maiores saepe
                doloribus, voluptate quibusdam aliquam aliquid eius modi sequi nisi illum maxime sapiente.</p>
            <p>Dolor sit amet consectetur adipisicing elit. Animi magnam, at cum sed perferendis quidem tempora vero.
                Deleniti nobis in modi beatae sit.</p>
        </section>

        <section id="workflow">
            <h2>Design Workflow</h2>
            <p>Aliquam erat volutpat. Phasellus tristique, nunc vitae convallis tempor, mi magna suscipit ex, vel
                accusamus ex. Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis
                egestas.</p>
            <p>In hac habitasse platea dictumst. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut
                enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
            </p>
            <p>Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
                Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est
                laborum.</p>
        </section>

        <section id="docs">
            <h2>Documentation</h2>
            <p>Cras sit amet nibh libero, in gravida nulla. Nulla vel metus scelerisque ante sollicitudin commodo. Cras
                purus odio, vestibulum in vulputate at, tempus viverra turpis.</p>
            <p>Fusce condimentum nunc ac nisi vulputate fringilla. Donec lacinia congue felis in faucibus. Praesent
                commodo cursus magna, vel scelerisque nisl consectetur et.</p>
            <p>Nullam id dolor id nibh ultricies vehicula ut id elit. Morbi leo risus, porta ac consectetur ac,
                vestibulum at eros. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor.</p>
        </section>

        <section id="about">
            <h2>About Us</h2>
            <p>Curabitur blandit tempus porttitor. Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis
                vestibulum. Vestibulum id ligula porta felis euismod semper.</p>
            <p>Nullam quis risus eget urna mollis ornare vel eu leo. Maecenas sed diam eget risus varius blandit sit
                amet non magna. Cras mattis consectetur purus sit amet fermentum.</p>
            <p>Aenean lacinia bibendum nulla sed consectetur. Donec ullamcorper nulla non metus auctor fringilla. Duis
                mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
        </section>
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</html>
				
			

css code

				
					:root {
    --fb-blue: #1877F2;
    --header-height: 70px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: #ede8d2;
    color: #333;
    line-height: 1.6;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    height: var(--header-height);
    background: #ffffff;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 5%;
    z-index: 1000;
}

.logo {
    font-weight: 700;
    font-size: 24px;
    color: var(--fb-blue);
}

nav a {
    text-decoration: none;
    color: #333;
    padding: 8px 16px;
    margin-left: 5px;
    border-radius: 6px;
    font-weight: 600;
    transition: 0.3s ease;
    font-size: 14px;
}

nav a:hover,
nav a.active {
    background-color: #e8f2f4;
    color: var(--fb-blue);
}

section {
    min-height: 100vh;
    padding: 100px 15% 40px;
    border-bottom: 1px solid #d1cdb8;
    scroll-margin-top: var(--header-height);
}

h2 {
    color: var(--fb-blue);
    margin-bottom: 20px;
    font-size: 32px;
}

p {
    margin-bottom: 20px;
    font-size: 18px;
}
				
			

Javascript code

				
					const sections = document.querySelectorAll("section");
const navLinks = document.querySelectorAll("header nav a");

const observer = new IntersectionObserver(
  (entries) => {
    entries.forEach((entry) => {
      if (entry.isIntersecting) {
        navLinks.forEach((link) => link.classList.remove("active"));
        const activeId = entry.target.getAttribute("id");
        document
          .querySelector(`header nav a[href="#${activeId}"]`)
          .classList.add("active");
      }
    });
  },
  {
    threshold: 0.5,
  },
);

sections.forEach((section) => observer.observe(section));