freeCodeCamp/common/app/routes/challenges/views/step/step.less

// should match ./ns.json value and filename
@ns: step;

.@{ns}-description {
  font-size: 1.5em;
}
.@{ns}-counter {
  font-size: 20px;
  line-height: 44px;
}

.@{ns}-forward-leave {
  transition: opacity .4s ease-in, transform .3s ease-in-out;
  opacity: 1;
  transform: translate(0, 0);
}

.@{ns}-forward-leave-active {
  opacity: 0;
  transform: translate(-100%, 0);
}

.@{ns}-forward-enter {
  transition: opacity .4s ease-in, transform .3s ease-in-out;
  opacity: 0;
  transform: translate(100%, 0);
}

.@{ns}-forward-enter-active {
  opacity: 1;
  transform: translate(0, 0);
}

.@{ns}-backward-leave {
  transition: opacity .4s ease-in, transform .3s ease-in-out;
  opacity: 1;
  transform: translate(0, 0);
}

.@{ns}-backward-leave-active {
  opacity: 0;
  transform: translate(100%, 0);
}

.@{ns}-backward-enter {
  transition: opacity .4s ease-in, transform .3s ease-in-out;
  opacity: 0;
  transform: translate(-100%, 0);
}

.@{ns}-backward-enter-active {
  opacity: 1;
  transform: translate(0, 0);
}