body{background:url(/images/about/bg2.png) center 116px no-repeat,url(/images/about/bg.png) center 116px no-repeat,url(../images/index/bg.png) repeat}
#aboutContent{width:1200px;margin:0 auto;padding-top:250px}
#aboutContent .sidebar{width:240px;height:50px}
#aboutContent .sidebar ul{width:1200px;box-shadow:1px 6px 6px rgba(0,0,0,.3);display: flex;}
#aboutContent .sidebar ul li{float:left;width:20.59%;height:50px;background:#2d3347;border-left:1px solid #414a67;text-align:center;color:#adb1c9;line-height:50px;cursor:pointer}
#aboutContent .sidebar ul li:nth-child(1){border-left:none}
#aboutContent .sidebar ul li.on{background:url(/images/about/libg.jpg) top center;color:#fff}
#aboutContent .sidebar ul li .iconfont{vertical-align:middle}
.contentBox{background:#1d2131;color:#adb1c9;font-size:16px;padding:40px;line-height:2}
.contentBox .item dt{font-size:24px}
.contentBox .item{display:none}
.contentBox .on{display:block}