.unit-nav {
  margin: 2em 0;
  text-align: center;
}
.unit-nav a {
  display: inline-block;
  padding: 8px 16px;
  background: #f1f1f1;
  color: #333;
  text-decoration: none;
  border-radius: 6px;
  transition: background 0.2s;
}

.unit-nav a:hover {
  background: #ddd;
}