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console

const nav = document.getElementById('nav');
const toggle = document.getElementById('toggle');

toggle.addEventListener('click', () => {
    nav.classList.toggle('active');
})

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

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Animated Navigation</title>
  <link rel="stylesheet" href="./style.css">
</head>

<body>
  <nav id="nav" class="active">
    <ul>
      <li>
        <a href="#">Home</a>
      </li>
      <li>
        <a href="#">Works</a>
      </li>
      <li>
        <a href="#">About</a>
      </li>
      <li>
        <a href="#">Contact</a>
      </li>
    </ul>
    <button class="icon" id="toggle">
      <div class="line line1"></div>
      <div class="line line2"></div>
    </button>
  </nav>
  
  <script src="./script.js"></script>
  <!-- Dribbble link: https://dribbble.com/shots/2427219-Header-Navigation-Day-053-dailyui -->

</body>

</html>

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

body {
  background-image: linear-gradient(to Bottom, #eafbff 0%, #eafbff 50%, #5290f9 50%, #5290f9 100%);
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: sans-serif;
}


nav{
  background-color: #fff;
  padding: 20px;
  width: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: width 0.6s linear;
  border-radius: 3px;
  box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
  overflow-x:hidden;
}

nav.active{
  width: 350px;
}

nav ul {
  display: flex;
  align-items: center;
  justify-content: center;
  list-style-type: none;
  width: 0;
  transition: width 0.6s linear;

}

nav.active ul{
  width: 100%;
}


nav ul li{
  opacity: 0;
  transition: all 0.6s linear;
}

nav.active ul li{
  opacity: 1;
  transform:rotateY(360deg);
}


nav ul li a{
  text-decoration: none;
  color:#000;
  margin: 0 10px;
}

nav .icon{
  background-color: #fff;
  width: 30px;
  height: 30px;
  cursor: pointer;
  border: 0;
  position: relative;
}


.icon .line{
  background-color: #5290f9;
  width: 20px;
  height: 2px;
  position: absolute;
  top: 10px;
  left:5px;
  transition: transform 0.6s linear;

}

.icon .line2{
  top: 18px;
}

nav.active .icon .line1{
  transform: rotate(-765deg) translateY(5.5px);
}
nav.active .icon .line2{
  transform: rotate(765deg) translateY(-5.5px);
}