div#menu {
  height: 40px;
  margin-right: 100px;
  background-color: transparent;
  overflow: hidden;
  z-index: 1;
  position: relative;
  text-transform: uppercase;
  font-size: large;
  letter-spacing: 10px;
  font-weight: 100;
  text-align: center;
  line-height: 50px;
  opacity: 0.7;
}

div.active-page {
  font-weight: 400;
}

div#link {
  width: 200px;
  height: 100%;
  float: right;
  position: relative;
  color: #000;
  text-decoration: none;
}

div#link:hover {
  color: #000;
  opacity: 1;
}

div#link:before {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: 0;
  left: 0;
  background-color: #000;
  visibility: hidden;
  -webkit-transform: scaleX(0);
  transform: scaleX(0);
  -webkit-transition: all 0.3s ease-in-out 0s;
  transition: all 0.3s ease-in-out 0s;
}

div#link:hover::before {
  visibility: visible;
  -webkit-transform: scaleX(1);
  transform: scaleX(1);
}