.uk-comment p {
  transition: all .3s;
  height: 75px;
  overflow: hidden;
}

.uk-comment .hideAll {
  display: none;
}

.uk-comment.openComment p {
  height: auto;
}

.uk-comment.openComment .readAll {
  display: none;
}

.uk-comment.openComment .hideAll {
  display: inline;
}