.gnav-item-v1{
  position: relative
}

.gnav-item-v1 .gnav-item-content {
  -webkit-transition: all 0.1s ease-in-out; 
  -moz-transition: all 0.1s ease-in-out;
  -ms-transition: all 0.1s ease-in-out;
  -o-transition: all 0.1s ease-in-out;
  transition: all 0.1s ease-in-out;
  visibility: hidden;
  opacity: 0;
  width: auto;
  z-index: 999;
  max-height: 85%;
  max-height: calc(100% - 100px);
  overflow-y: auto;
  display: none;
}

.gnav-item-v1.hover .gnav-item-content {
  -webkit-transition: all 0.1s ease-in-out;
  -moz-transition: all 0.1s ease-in-out;
  -ms-transition: all 0.1s ease-in-out;
  -o-transition: all 0.1s ease-in-out;
  transition: all 0.1s ease-in-out;
  opacity: 1;
  visibility: visible;
  width: auto;
  max-height: 85%;
  max-height: calc(100% - 100px);
  overflow-y: auto;
  display: block;
}