body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 50px;
    background-color: #f4f4f9;
}

h1 {
    color: #333;
}

button {
    font-size: 20px;
    padding: 10px 20px;
    margin-top: 20px;
    cursor: pointer;
}

#timer {
    font-size: 18px;
    margin-top: 10px;
}