.column-key {
  transform: rotate(45deg);
  font-size: 0.7rem;
  line-height: 1.5;
  margin-right: 0.2rem;

  &.key-pri {
    color: goldenrod;
  }

  &.key-uni {
    color: deepskyblue;
  }

  &.key-mul {
    color: palegreen;
  }
}