css - Make scrollbars only visible when a Div is hovered over?

Question

I am trying to figure out how to have a scrollable div that only shows its scrollbars when Hovered.

Example is Google Image search, in the image below you can see how the left sidebar does not appear to be scroll-able until you hover the mouse over it.

Is this possible with CSS or is Javascript required? If possible maybe a quick example how to do such a task?

Answer 1

div {
  height: 100px;
  width: 50%;
  margin: 0 auto;
  overflow: hidden;
}

div:hover {
  overflow-y: scroll;
}

<div>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum.
  </p>
</div>