.topNav {
  position: sticky;
  top: 80px;
  z-index: 98;
  border-bottom: 1px solid #D8D8D8;
  background-color: #2265D5;

}
.topNav .navItem {
  flex: 0 0 auto;
  max-width: 230px;
  height: 60px;
  line-height: 60px;
  box-sizing: border-box;
  padding: 0 40px;
  text-align: center;
  font-size: 16px;
  font-weight: 700;
  color: #fff;
}
.topNav .curItem {
  border-bottom: 5px solid #fff;
  color: #fff;
}