.sub-navbar-item {
  position: relative;
}
.sub-navbar-item:hover:before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 100%;
}
.sub-navbar-item.active_item:before {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  height: 2px;
  width: 100%;
}