html, body {
            height: 100%;
            margin: 0;
            padding: 0;
        }
        body {
            display: flex;
            flex-direction: column;
            font-family: Arial, sans-serif;
            max-width: 1400px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f9f9f9;
            box-sizing: border-box;
        }
        .logo {
            display: block;
            margin: 0 auto;
            max-width: 500px;
            width: 100%;
            height: auto;
        }
        header {
            text-align: center;
            padding: 20px;
        }
        main {
            background: #ffffff;
            padding: 40px;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
            flex-grow: 1;
        }
        section {
            text-align: center;
        }
        button {
            background-image: linear-gradient(45deg, #ff0000, #ff7300, #ffea00, #008000, #0000ff, #4b0082, #ee82ee);
            color: #ffffff;
            border: none;
            padding: 10px 20px;
            font-size: 1em;
            cursor: pointer;
            border-radius: 5px;
            transition: background-position 0.3s ease;
            background-size: 200% 200%;
            background-position: 0% 50%;
        }
        button:hover {
            background-position: 100% 50%;
        }
        footer {
            text-align: center;
            margin-top: 20px;
            font-size: 0.9em;
            color: #777;
            flex-shrink: 0;
        }