main > ul{
    position: relative;/*相对定位*/
    width: 1300px;
    /* height: 1480px; */
    background-color: rgb(248, 248, 248);
    margin: 50px auto 0;
}
main > ul > li:first-of-type{
    width: 1300px;
    height: 800px;
    background-color: rgb(33, 173, 108);
    box-shadow:0px 55px 30px -15px rgba(187, 187, 187,0.9);/*阴影*/
    /*z-index:1;/* 定位层级 */
}
main > ul > li:last-of-type{
    top: 200px;
    left: 200px;
    width: 1300px;
    margin: 0 0 50px 0;
    /* height: 580px; */
    /* background-color: rgb(172, 231, 255); */
}
main > ul > li:last-of-type > p{
    width: 1200px;
    margin: 0 0 15px 50px;
    /* background-color: rgb(248, 248, 248); */
    font-size:15px;/*字体大小*/
}
main > ul > li:last-of-type > p:first-of-type{
    margin-top: 50px;
}
.design{
    text-indent: 30px;  /*文本缩进*/
}
.design1{
    font-weight:bold;/*字体粗细*/
    color: rgb(0, 0, 0);/*字体颜色 */
}