html, body {
    height: 100%;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #f0f0f0; /* Light grey background */
}

#speed {
    font-size: 10vw; /* Very large font size based on viewport width */
    font-family: 'Courier New', Courier, monospace;
    color: #333; /* Dark grey color for the text */
    text-align: center;
}