.download-btn {
    padding: 10px 20px;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

/* CSS cho spinner */
.loading {
    cursor: not-allowed;
    opacity: 0.7;
}

.loading .spinner {
    margin-right: 8px;
}