body {
    background-color: #f8f9fa;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
    width: 50%;
}

.dropzone {
    border: 2px dashed #007bff;
    border-radius: 5px;
    padding: 20px;
    cursor: pointer;
    margin-top: 20px;
}

.dropzone.dragging {
    background-color: #e9ecef;
}

.progress-container {
    margin-top: 20px;
}

.loader {
    border: 16px solid #f3f3f3;
    border-radius: 50%;
    border-top: 16px solid #3498db;
    width: 120px;
    height: 120px;
    animation: spin 2s linear infinite;
    display: none;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.flashes {
    list-style-type: none;
    padding: 0;
}

.flashes li {
    margin: 10px 0;
}