.HelpCenter{background-color:#fff}.HelpCenter .tab div{height:40px;font-size:18px;line-height:40px;text-align:center;cursor:pointer}.HelpCenter .tab div img{width:30px;height:30px}.HelpCenter .tab .active{background-color:#ccc}.el-collapse-item__header,.el-collapse-item__wrap{background-color:#f2f2f2}