body {
    font-family: Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: #f7f7f7;
}

.back-button {
    align-self: flex-start;
    margin: 20px;
}

.back-button button {
    padding: 10px 20px;
    border: none;
    background-color: #007bff;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
}

.upload-container {
    text-align: center;
    border: 2px dashed #007bff;
    padding: 20px;
    border-radius: 10px;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

.drop-zone {
    border: 2px dashed #007bff;
    border-radius: 10px;
    padding: 20px;
    margin-top: 10px;
    cursor: pointer;
    background-color: #f9f9f9;
}

.drop-zone.dragover {
    background-color: #e2eefd;
}

button {
    margin-top: 20px;
    padding: 10px 20px;
    border: none;
    background-color: #007bff;
    color: #fff;
    border-radius: 5px;
    cursor: pointer;
}

button:disabled {
    background-color: #cccccc;
}

#status {
    margin-top: 20px;
    color: red;
}

@media (max-width: 600px) {
    .upload-container {
        width: 90%;
    }

    .back-button {
        margin: 10px;
    }

    .back-button button {
        padding: 8px 16px;
    }
}