.main{height:calc(100% - 40px);padding-top:10px;padding-left:calc(50vw - 600px);padding-right:calc(50vw - 600px);padding-bottom:10px;background-color:#f6f6f6}.nav{width:154px;height:70px;margin:10px 10px 0 10px;cursor:pointer;border-radius:4px;font-size:16px;font-family:Source Han Sans CN;font-weight:400;line-height:70px}.nav:hover,.nav_hover{background:-webkit-gradient(linear,left top,right top,from(#0a92df),to(#199eea));background:-o-linear-gradient(left,#0a92df,#199eea);background:linear-gradient(90deg,#0a92df,#199eea);color:#fff}.nav span{margin:27px 0 28px 15px}