.class-link span {
  display: inline-block;
  background-color: transparent;
  padding: 2px;
  font-family: monospace;
  font-size: 0.8125em;
  transition: background-color 0.25s linear;
}
.class-link span.dynamic {
  cursor: pointer;
}
.class-link span.active {
  background-color: yellow;
}