.c-read-more {
  visibility: hidden;
}

.c-read-more.is-visible {
  visibility: visible;
}

.c-read-more__content {

}

.c-read-more__link span:last-of-type {
  display: none;
}

.c-read-more__link.is-toggled span:first-of-type {
  display: none;
}

.c-read-more__link.is-toggled span:last-of-type {
  display: inline;
}