Vertical Menu with Sliding Effect

<!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>Vertical NavBar with Sliding Effect</title>
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Montserrat:[email protected]&display=swap" rel="stylesheet">
    <style>
         * {
            margin: 0;
            padding: 0;
            font-family: 'Montserrat', sans-serif;
        }

        body {
            background-color: #f2f2f2;
        }

        :root {
            --red: #e44134;
            --gray: #2b2b2b;
            --white: #fff;
            --transWhite: rgba(255,255,255, 0.1);
        }

        section#mainArea {
            width: 100%;
            height: 100vh;
            position: relative;
        }

        section#mainArea nav {
            width: 250px;
            position: absolute;
            left: -250px;
            top: 0;
            bottom: 0;
            background-color: var(--red);
            transition: 0.3s all ease-in-out;
        }

        section#mainArea.active nav {
            left: 0;
        }

        #menuBtn {
            position: absolute;
            right: -30px;
            top: 5px;
            width: 30px;
            height: 25px;
            background-color: transparent;
            border: none;
            cursor: pointer;
            z-index: 10;
        }

        #menuBtn span {
            position: absolute;
            width: 100%;
            height: 3px;
            background-color: var(--gray);
            transition: 0.2s all ease;
        }

        #menuBtn span:nth-child(1) {
            transform: translateY(-10px);
        }

        #menuBtn span:nth-child(2) {
            transform: translateY(10px);
        }

        #menuBtn:hover span:nth-child(1) {
            transform: translateY(-13px);
        }

        #menuBtn:hover span:nth-child(2) {
            transform: translateY(13px);
        }

        #menuBtn.active span:nth-child(1) {
            transform: translateY(-30px);
            opacity: 0;
        }

        #menuBtn.active span:nth-child(2) {
            transform: translateY(30px);
            opacity: 0;
        }

        #menuBtn span:nth-child(3),
        #menuBtn span:nth-child(4) {
            transform: rotate(0deg);
        }

        #menuBtn.active span:nth-child(3) {
            transform: rotate(-45deg);
        }

        #menuBtn.active span:nth-child(4) {
            transform: rotate(45deg);
        }

        #menuList {
            list-style: none;
        }

        #menuList li {
            margin: 8px 0;
            position: relative;
            background-color: var(--transWhite);
            overflow: hidden;
        }

        #menuList li::before {
            position: absolute;
            content: '';
            height: 3px;
            left: 0;
            bottom: 0;
            width: 0;
            background-color: var(--white);
            transition: 0.3s all ease-in-out;
        }

        #menuList li:hover::before {
            border-radius: 0 50px 50px 0;
            width: 110%;
        }

        #menuList li.active::before {
            width: 80%;
        }

        #menuList li a {
            display: block;
            padding: 12px 20px;
            color: var(--white);
            text-decoration: none;
            font-size: 16px;
            font-weight: 500;
            position: relative;
            z-index: 1;
        }

        section#mainArea #contentArea {
            width: 100%;
            position: absolute;
            right: 0;
            top: 0;
            bottom: 0;
            transition: 0.3s all ease-in-out;
        }

        section#mainArea.active #contentArea {
            width: calc(100% - 250px);
        }

        section#mainArea #contentArea .inner {
            padding: 50px;
        }

        section#mainArea #contentArea h1 {
            font-size: 30px;
            color: var(--red);
            margin-bottom: 8px;
        }

        section#mainArea #contentArea p {
            font-size: 18px;
            color: var(--gray);
            line-height: 30px;
        }
    </style>

    <script>
        function toggleMenu() {
            let menuBtn = document.getElementById('menuBtn');
            let mainArea = document.getElementById('mainArea');
            menuBtn.classList.toggle('active');
            mainArea.classList.toggle('active');
        }
    </script>
</head>
<body>
    <section id="mainArea">
        <nav>
            <button type="button" id="menuBtn" onclick="toggleMenu()">
                <span></span>
                <span></span>
                <span></span>
                <span></span>
            </button>
            <ul id="menuList">
                <li>
                    <a href="">Dashboard</a>
                </li>
                <li class="active">
                    <a href="">Product</a>
                </li>
                <li>
                    <a href="">Order List</a>
                </li>
                <li>
                    <a href="">Analytics</a>
                </li>
                <li>
                    <a href="">Settings</a>
                </li>
            </ul>
        </nav>
        <section id="contentArea">
            <div class="inner">
                <h1>Lorem ipsum dolor sit amet</h1>
                <p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Harum quod sapiente sit odio atque aliquid ipsa sint accusantium. Impedit distinctio quasi accusamus maxime autem veniam, fuga voluptatum officia reprehenderit commodi?</p>
            </div>
        </section>
    </section>
</body>
</html>
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Result Screenshot(s)

Vertical Menu with Sliding EffectWorking Sample0