Gradient Blue Sidebar

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Gradient Blue Sidebar</title>
    <style>
        body {
            margin: 0;
            font-family: Arial, sans-serif;
            background: #ecf0f3;
            height: 100vh;
            overflow: hidden;
        }
        .sidebar {
            width: 15%;
            height: 100vh;
            background: #0f2027;
            background-image: linear-gradient(to top left, rgba(0, 0, 0, .2), rgba(0, 0, 0, .2) 30%, rgba(0, 0, 0, 0)), linear-gradient(to bottom right, #2c5364, #0f2027);
            box-shadow: inset 2px 2px 3px rgba(255, 255, 255, .6), inset -2px -2px 3px rgba(0, 0, 0, .6), 5px 5px 20px rgba(0, 0, 0, .2), -5px -5px 20px rgba(255, 255, 255, .5);
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 4%;
            position: fixed;
            left: 0;
            top: 0;
            z-index: 1000;
        }
        .sidebar h2 {
            color: #fff;
            margin-bottom: 30px;
            font-size: 24px;
            font-weight: bold;
        }
        .sidebar .close-btn {
            align-self: flex-end;
            cursor: pointer;
            font-size: 20px;
            color: #fff;
            margin-bottom: 20px;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
            width: 100%;
        }
        .sidebar ul li {
            width: 100%;
            padding: 15px 0;
            text-align: left;
            padding-left: 20px;
            transition: all 0.3s ease;
            cursor: pointer;
            display: flex;
            align-items: center;
            margin-top: 20px;
        }
        .sidebar ul li:hover {
            background: rgba(0, 0, 0, 0.1);
            transform: scale(1.05);
        }
        .sidebar ul li i {
            font-size: 20px;
            margin-right: 15px;
            vertical-align: middle;
            color: #fff;
        }
        .sidebar ul li span {
            font-size: 18px;
            vertical-align: middle;
            color: #fff;
        }
        .sidebar ul li:nth-child(odd) {
            background: linear-gradient(145deg, #0f2027, #2c5364);
            box-shadow: 5px 5px 10px #2c5364, -5px -5px 10px #0f2027;
            border-radius: 10px;
        }
        .sidebar ul li:nth-child(even) {
            background: linear-gradient(145deg, #2c5364, #0f2027);
            box-shadow: 5px 5px 10px #2c5364, -5px -5px 10px #0f2027;
            border-radius: 10px;
        }
        .sidebar ul li:hover:nth-child(odd) {
            box-shadow: inset 5px 5px 10px #2c5364, inset -5px -5px 10px #0f2027;
        }
        .sidebar ul li:hover:nth-child(even) {
            box-shadow: inset 5px 5px 10px #2c5364, inset -5px -5px 10px #0f2027;
        }
        @keyframes slideIn {
            from {
                left: -300px;
                opacity: 0;
            }
            to {
                left: 0;
                opacity: 1;
            }
        }
        .sidebar {
            animation: slideIn 0.5s forwards;
        }
    </style>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css">
</head>
<body>
    <div class="sidebar">
        <span class="close-btn">&times;</span>
        <h2>My Sidebar</h2>
        <ul>
            <li><i class="fas fa-home"></i><span>Home</span></li>
            <li><i class="fas fa-user"></i><span>Profile</span></li>
            <li><i class="fas fa-cog"></i><span>Settings</span></li>
            <li><i class="fas fa-envelope"></i><span>Messages</span></li>
            <li><i class="fas fa-bell"></i><span>Notifications</span></li>
        </ul>
    </div>
    <script>
        document.querySelector('.close-btn').addEventListener('click', function() {
            document.querySelector('.sidebar').style.display = 'none';
        });
    </script>
</body>
</html>

Gradient Blue Sidebar - MeggiTools