body {
    font-family: Arial, sans-serif;
    background-color: #f4f4f4;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 20px;
}

.container {
    width: 100%;
    background-color: white;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    border-radius: 10px;
    padding: 20px;
}

.button-container {
    display: flex;
    justify-content: space-between;
    gap: 10px; /* 按鈕間距 */
}

.button-container .btn {
    flex: 1; /* 讓每個按鈕均分寬度 */
    text-align: center; /* 文字置中 */
}