body {
    margin: 0;
    background: #111;
    color: white;
    text-align: center;
    font-family: sans-serif;
}

h1 {
    margin: 20px;
}

video {
    width: 90%;
    max-width: 600px;
    border-radius: 50%;
}

button {
    margin-top: 20px;
    padding: 15px 30px;
    font-size: 18px;
}