.mainBox{width:100%}.mainBox .headBox{background-color:#00f;height:60px;left:0;position:fixed;top:0;width:100%;z-index:10}.mainBox .centerBox{display:flex;padding-left:200px;padding-top:60px}.mainBox .centerBox .menuBox{background-color:red;height:calc(100vh - 60px);left:0;position:fixed;top:60px;width:200px}.mainBox .centerBox .infoBox{background-color:#ff0;flex:auto;height:200px}