body {
    font-family: 微軟正黑體, "Times New Roman", sans-serif;
    font-size: 100%;
}

.error {
    color: red;
}

.lg {
    display: flex;
    /* 水平置中 */
    justify-content: center;
    /* 垂直置中 */
    align-content: center;
    flex-wrap: wrap;
}