body {
  height: 100%;
  width: 100%;
}

.letter {
  font-size: 50px;
}

.first .letter.hide {
  opacity: 0;
  transform: translate(0, 20px);
}

.second .letter.hide {
  opacity: 0;
  transform: translate(0, -20px);
}

.letter.showin {
  transform: translate(0, 0);
  transition: all 0.2s;
}

.letter {
  display: inline-block;
}

.first, .second {
  margin: 5px;
  height: 30px;
  overflow: hidden;
  display: block;
}

.second .letter {
  vertical-align: bottom;
  margin-top: -35px;
}

.first .letter {
  vertical-align: top;
  margin-top: -5px;
}

.line {
  display: block;
  margin: 10px;
}