body {
    font-family: Arial, sans-serif;
    margin: 20px;
}
h1 {
    color: #333;
}
#folder-list, #subfolder-list, #file-list {
    margin: 10px 0;
}
button {
    margin: 5px;
    padding: 10px;
    background-color: #007BFF;
    color: white;
    border: none;
    cursor: pointer;
}
button:hover {
    background-color: #0056b3;
}
audio {
    margin-top: 20px;
    width: 100%;
}