.nav-link {
  color: white;
  text-decoration: none;
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 2px;
  bottom: -1px;
  left: 0;
  background-color: white;
  visibility: hidden;
  transform: scaleX(0);
  transition: all 0.3s ease-in-out;
}

.nav-link:hover::after,
.nav-link:focus::after,
.nav-link.active::after {
  visibility: visible;
  transform: scaleX(1);
}

.navbar-expand-md {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
}