<nav>
  <a href="#section1">Section 1</a>
  <a href="#section2">Section 2</a>
  <a href="#section3">Section 3</a>
</nav>

<section id="section1">
  <h1>Section 1</h1>
  <a href="#section2">Scroll to Section 2</a>
</section>

<section id="section2">
  <h1>Section 2</h1>
  <a href="#section3">Scroll to Section 3</a>
</section>

<section id="section3">
  <h1>Section 3</h1>
  <a href="#section1">Back to Section 1</a>
</section>
html {
  scroll-behavior: smooth;
}

body {
  font-family: Arial, sans-serif;
}

nav {
  position: fixed;
  top: 0;
  width: 100%;
  background-color: #282c34;
  padding: 10px;
  text-align: center;
}

nav a,
section a {
  margin: 0 15px;
  color: white;
  text-decoration: none;
  font-size: 18px;
}

section {
  height: 100vh;
  padding: 50px;
  background-color: #f0f0f0;
}

#section1 {
  background-color: #8e44ad;
  color: white;
}
#section2 {
  background-color: #3498db;
  color: white;
}
#section3 {
  background-color: #2ecc71;
  color: white;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.