body {
    background-image: url(bg.jpg);
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    font-size: 2em;
    color: blueviolet;
    text-align: center;
}

#btn {
    background-color: blueviolet;
    color: white;
    font-size: large;
    border: none;
    padding: 20px 30px;
    border-radius: 15px;
}