.global_header a {
  position: relative;
  display: inline-block;
  text-decoration: none;
}
.global_header a::after {
  position: absolute;
  bottom: -7px;
  left: 0;
  content: '';
  width: 100%;
  height: 2px;
  background: #73A776;
  transform: scale(0, 1);
  transform-origin: center top;
  transition: transform .4s;
}
.global_header a:hover::after {
  transform: scale(1, 1);
}