body {
    display: flex;
    align-items: center; /*定义body的元素垂直居中*/
    justify-content: center; /*定义body的里的元素水平居中*/
}

/*注册*/
#middle {
    width: 600px;
    margin: 0 auto;
    margin-top: 100px;
    margin-bottom: 100px;
    font-size: 14px;
}

.table-col1 {
    text-align: right;
}

.table-col2 {
    text-align: left;
}

td {
    height: 40px;
}

    td input {
        width: 80%;
        border: #cacaca 1px solid;
        height: 18px;
        line-height: 18px;
    }

.remark {
    font-size: 12px;
}