How can I add a vertical scrollbar to my div automatically?

I want to add a vertical scrollbar to my <div>. I've tried overflow: auto, but it is not working. I've tested my code in Firefox and Chrome.

I'm pasting the div style code here:

float: left;
width: 1000px;
overflow: auto;

You need to assign some height to make the overflow: auto; property work.
For testing purpose, add height: 100px; and check.
and also it will be better if you give overflow-y:auto; instead of overflow: auto;, because this makes the element to scroll only vertical but not horizontal.

float:left;
width:1000px;
overflow-y: auto;
height: 100px;

If you don't know the height of the container and you want to show vertical scrollbar when the container reaches a fixed height say 100px, use max-height instead of height property.

For more information, read this MDN article.

You have to add max-height property.

.ScrollStyle
{
    max-height: 150px;
    overflow-y: scroll;
}

<div class="ScrollStyle">
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
  Scrollbar Test!<br/>
</div>

I got an amazing scroller on my div-popup. To apply, add this style to your div element:

overflow-y: scroll;
height: XXXpx;

The height you specify will be the height of the div and once if you have contents to exceed this height, you have to scroll it.

Thank you.

To show vertical scroll bar in your div you need to add

height: 100px;   
overflow-y : scroll;

or

height: 100px; 
overflow-y : auto;

I'm not quite sure what you're attempting to use the div for, but this is an example with some random text.

Mr_Green gave the correct instructions when he said to add overflow-y: auto as that restricts it to vertical scrolling. This is a JSFiddle example:

http://jsfiddle.net/MitulP91/xEy9E/3/">JSFiddle</a>

Since OS X Lion, the scrollbar on websites are hidden by default and only visible once you start scrolling. Personally, I prefer the hidden scrollbar, but in case you really need it, you can overwrite the default and force the scrollbar in WebKit browsers back like this:

::-webkit-scrollbar {
    -webkit-appearance: none;
    width: 7px;
}
::-webkit-scrollbar-thumb {
    border-radius: 4px;
    background-color: rgba(0,0,0,.5);
    -webkit-box-shadow: 0 0 1px rgba(255,255,255,.5);
}