body {
    margin: 0;
}

.highlight {
    background-color: black;
    color: white;
    font-size: 50px;
}

#controls {
    margin-top: 10px;
}

#progress {
    width: 100%;
    background-color: #f3f3f3;
    border: 1px solid #ccc;
    height: 20px;
}

#progress-bar {
    height: 100%;
    width: 0%;
    background-color: #4caf50;
}