Simple, good looking, css only, burger menu

snippet.html

<style>
/* Burger Menu Styles */
.burger-menu {
    position: relative;
    z-index: 1001;
}

.burger-icon {
    position: fixed;
    top: 20px;
    left: 20px;
    width: 30px;
    height: 22px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
    z-index: 1001;
}

.burger-icon span {
    display: block;
    width: 100%;
    height: 4px;
    background-color: #333; /* Set a default color for the burger icon */
    transition: all 0.3s ease-in-out;
}

#burger-toggle {
    display: none;
}

#burger-toggle:checked + .burger-icon span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
    background-color: #fff; /* Set to white for contrast */
}

#burger-toggle:checked + .burger-icon span:nth-child(2) {
    opacity: 0;
}

#burger-toggle:checked + .burger-icon span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
    background-color: #fff; /* Set to white for contrast */
}

.burger-nav {
    position: fixed;
    top: 0;
    left: -100%;
    width: 250px;
    height: 100%;
    background-color: #333;
    color: white;
    transition: left 0.3s ease-in-out;
    z-index: 1000;
}

#burger-toggle:checked ~ .burger-nav {
    left: 0;
}

.burger-nav ul {
    list-style: none;
    padding: 60px 20px;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.burger-nav ul li a {
    color: white;
    text-decoration: none;
    font-size: 1.2em;
}

.burger-nav ul li a:hover {
    color: #007bff;
}

}

</style>
<div class="burger-menu">
    <input type="checkbox" id="burger-toggle">
    <label for="burger-toggle" class="burger-icon">
        <span></span>
        <span></span>
        <span></span>
    </label>
    <nav class="burger-nav">
        <ul>
            <li><a href="/logout">Logout</a></li>
        </ul>
    </nav>
</div>
    
    
<script>
    // Close the menu when clicking outside
    document.addEventListener('click', function(event) {
        const burgerToggle = document.getElementById('burger-toggle');
        const burgerMenu = document.querySelector('.burger-menu');
        const isClickInside = burgerMenu.contains(event.target);

        if (!isClickInside) {
            burgerToggle.checked = false;
        }
    });
</script>