.expand-enter {
  overflow: hidden;
}

.expand-enter-active {
  transition: height 0.3s ease-out;
}

.expand-leave {
  overflow: hidden;
}

.expand-leave-active {
  transition: height 0.3s ease-out;
}

.notice {
  width: 200px;
  height: 100px;
  margin-top: 20px;
  border: 1px solid #ccc;
}