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;  }

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Would something like that work?