nav {
  border-bottom: 1px solid black;
}

.link ol {
  list-style-type: none;
  padding-left: 0;
}

.link {
  display: inline-block;
}

.link a::after {
  display: inline-block;
  color: black;
  content: "_";
  font-size: 80%;
  font-weight: bold;
  padding: 0 3px;
}