body {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    height: 100vh;
    text-align: center;
    font-family: Arial, sans-serif;
    background-color: #1e272e;
    color: white;
    font-weight: bold;
}
body.speed-warning {
    background-color: #c0392b;
}
h1 {
    font-size: 2em;
    margin-bottom: 20px;
}
.data-display {
    font-size: 2em;
    margin: 20px 0;
    display: flex;
    align-items: center;
}
.data-display i {
    margin-right: 10px;
}
button {
    font-size: 1.5em;
    padding: 15px 30px;
    margin-top: 20px;
    cursor: pointer;
    background-color: #27ae60;
    color: white;
    border: none;
    border-radius: 5px;
}
button:hover {
    background-color: #229954;
}