.no-webp #inner-head {background:url(https://qn.res.netease.com/pc/gw/20200824105157/img/bg_287ed9de.png) no-repeat center top}
.webp #inner-head {background:url(https://qn.res.netease.com/pc/gw/20200824105157/img/bg_287ed9de.webp) no-repeat center top}
#inner-head {
  width: 100%;
  height: 490px;
  position: relative;
}