.tedian{margin-top:10px;font-size:14px;margin-bottom:15px}.tedian li{list-style:disc;margin-left:16px;margin-top:5px;font-size:13px;letter-spacing:1px}.intro-doc{color:#fff;position:absolute;left:50%;top:50%;width:500px;transform:translate(-50%,-50%);padding:20px 15px;background:rgba(36,64,84,.8);border-radius:8px}@media screen and (max-width:1890px){.intro-doc{margin-top:30px}}