pma/themes/original/scss/_navbar.scss

.navbar-nav {
  font-weight: bold;
}

.navbar-nav .icon {
  vertical-align: middle;
  margin-right: 0.1em;
}

.navbar-nav .nav-item {
  border-bottom: 1pt solid black;

  &.active .nav-link {
    margin: 0;
    background-color: $body-bg;
    padding: 2px 4px;
  }
}

.navbar-nav .nav-link {
  margin: 2px 2px 0;
  padding: 2px 2px 0;
  background-color: $bg-one;
  border-color: $bg-two;
  border-style: solid;
  border-width: 1pt 1pt 0 1pt;
  border-radius: 0.4em 0.4em 0 0;

  &:hover {
    margin: 0;
    background-color: $body-bg;
    padding: 2px 4px;
  }
}