body {
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #f0f0f0;
            margin: 0;
            overflow: hidden;
            transition: opacity 1s;
        }
        body.focused {
            opacity: 1;
        }
        #button-container {
            text-align: center;
        }
        button {
            display: block;
            width: 200px;
            padding: 10px;
            margin: 10px auto;
            font-size: 16px;
            cursor: pointer;
        }
        h1 {
            margin-bottom: 20px;
        }