.underline:after {
  content: "";
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 8px;
  border-radius: 5px;
  background: rgb(44,155,97);
  z-index: -1;
}

#mainNav .navbar-nav > li.nav-item > a.nav-link.active {
  font-weight: 100 !important;
}