.scrollbox {
  background-image: linear-gradient(white, whitesmoke);
  border: solid 3px;
  border-radius: 10px;
  width: 250px;
  height: 50px;
  margin: auto;
  overflow-x: auto;
  overflow-y: hidden;
  transition: 0.7s ease;
}

.scrollbox:hover {
  height: 200px;
  overflow-y: scroll;
}