body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    font-family: Arial, sans-serif;
    background-color: #f0f0f0;
}

#videoElement {
    display: none;
    width: 640px;
    height: 480px;
    border: 1px solid #ddd;
}

#startButton {
    padding: 10px 20px;
    font-size: 18px;
    cursor: pointer;
    margin-top: 20px;
}

#countdown {
    font-size: 36px;
    margin-top: 20px;
}

#result {
    margin-top: 20px;
    font-size: 24px;
    font-weight: bold;
}