Elegant Shadow Container

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Elegant Shadow Container</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0-beta3/css/all.min.css">
    <style>
        body {
            margin: 0;
            font-family: 'Arial', sans-serif;
            background: linear-gradient(to bottom right, #a1c4fd, #c2e9fb);
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .container {
            position: relative;
            width: 80%;
            max-width: 600px;
            padding: 20px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 15px;
            box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1), inset 0 15px 30px rgba(0, 0, 0, 0.1);
            animation: shadowShift 2s ease-in-out infinite;
            overflow: hidden;
        }
        .container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.15), rgba(255, 255, 255, 0.1));
            z-index: 0;
            pointer-events: none;
        }
        .container-content {
            position: relative;
            z-index: 1;
            text-align: center;
            color: #333;
        }
        .container h1 {
            font-size: 2.5em;
            margin: 0;
            padding: 0;
        }
        .container p {
            font-size: 1.2em;
            margin-top: 10px;
        }
        .icon {
            font-size: 3em;
            margin: 20px 0;
            color: #a1c4fd;
        }
        @keyframes shadowShift {
            0% {
                box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1), inset 0 15px 30px rgba(0, 0, 0, 0.1);
            }
            50% {
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2), inset 0 20px 40px rgba(0, 0, 0, 0.2);
            }
            100% {
                box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1), inset 0 15px 30px rgba(0, 0, 0, 0.1);
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="container-content">
            <i class="fas fa-star icon"></i>
            <h1>Elegant Shadow</h1>
            <p>Enjoy a sophisticated shadow effect with an elegant gradient background.</p>
        </div>
    </div>
</body>
</html>

Elegant Shadow Container - VexaX