* {
    margin: 0px;
    padding: 0px;
}

#reg_box{
    margin: auto 0;
}

#reg_box h2 {
    text-align: center;
    font-family: '微软雅黑';
    font-size: 20px;
    margin-bottom: 10px;
    /* color: darkblue; */
    word-spacing: 5px;
}

@media (min-width: 768px) {/*在大屏幕上登录表单与图片水平平齐*/
    #parent_box {
        display: flex;
        align-items: center;
    }
}