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This is file  HTML  :

<button id="btn">☰</button>
<nav id="nav">
    <ul>
        <li><a href="#">Google</a></li>
        <li><a href="#">Youtube</a></li>
        <li><a href="#">Instagram</a></li>
        <li><a href="#">Facebook</a></li>
    </ul>
</nav>
                

This is file  CSS  :

* {
    box-sizing: border-box;
}

body {
    background-color: #fff;
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-family: 'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
    margin: 0;
    min-height: 100vh;
}

button {
    background-color: #000;
    border: none;
    color: white;
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem;
    transition: transform 0.3s ease-in-out;
}

button.active {
    transform: translateX(-197px);
}

nav {
    background-color: #000;
    position: fixed;
    top: 0;
    right: 0;
    height: 100vh;
    padding: 2rem;
    transform: translateX(100%);
    transition: transform 0.3s ease-in-out;
}

nav.active {
    transform: translateX(0);
}

nav ul {
    padding: 0;
    list-style-type: none;
    margin: 0;
}

nav ul li {
    padding: 2rem 0;
}

nav a {
    color: white;
    text-decoration: none;
}

This code for smooth  CSS  :

button {
    transition: transform 0.3s ease-in-out;
}

This is file  Javascript  :

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

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