ul.user-list {
  margin: 0;
  padding: 0;
  height: 519px;
  background-color: @whiter;
  overflow-x: hidden;
  overflow-y: auto;

  li.user {
    color: @black;
    padding: 3px 10px;
    cursor: default;

    &.me {
      color: @green;
    }

    &:hover {
      background-color: @lightblue;
    }
  }
}

div.description {
  height: 24px;
  line-height: 24px;
  padding: 3px 10px;
  margin-top: 1px;
  background-color: @whiter;
  color: @green;
}

ul.user-list {
  margin: 0;
  padding: 0;
  height: 519px;
  background-color: @whiter;
  overflow-x: hidden;
  overflow-y: auto;

  li.user {
    color: @black;
    padding: 3px 10px;
    cursor: default;
    background-color: @whiter;
    .transition(.1s linear background-color);

    &.me {
      color: @green;
    }

    &:hover {
      background-color: @lightblue;
    }
  }
}

div.description {
  height: 24px;
  line-height: 24px;
  padding: 3px 10px;
  margin-top: 1px;
  background-color: @whiter;
  color: @green;
}

Add transition for user list.
Add transition for user list.
