body {
    font-family: Arial, sans-serif;
    text-align: center;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
}

h1 {
    color: #333;
}

#drop-zone {
    width: 100%;
    height: 200px;
    border: 2px dashed #3498db;
    text-align: center;
    line-height: 200px;
    font-size: 1.5rem;
    color: #3498db;
    margin-bottom: 20px;
    cursor: pointer;
}

#drop-zone.hover {
    background-color: #f0f0f0;
}

#volume-result {
    font-size: 1.2rem;
    color: #333;
    margin-top: 20px;
}