.error {
    width: 20rem;
}

.upload-area {
    border: 2px dashed #ccc;
    padding: 20px;
    text-align: center;
    cursor: pointer;
}

.upload-area:hover {
    border-color: #888;
}

#progress-bar {
    width: 0%;
    height: 5px;
    background: #4CAF50;
    margin-top: 10px;
    transition: width 0.3s;
}

.file-list {
    margin-top: 20px;
    font-family: sans-serif;
}