Ok, per my comment, here's the answer:
You are currently experiencing double scrollbars, one for the window and one for the div, as I show here: http://jsfiddle.net/eL5yvony/
There are a couple of ways to correct this.
First, and probably the easiest, is to set the overflow: hidden;
on the html and body elements like so: http://jsfiddle.net/eL5yvony/1/
html, body {
width: 100%;
height: 100%;
overflow: hidden;
}
This eliminates the browser's scroll bar and only shows the one in the div
Alternatively, if your div is 100% x 100%, then you could do something like this by setting the margin and padding of your html and body elements, without overriding the browser's scroll functionality: http://jsfiddle.net/eL5yvony/4/
div{
width: 100%; height: 100%;
overflow: scroll;
}
html, body{
width: 100%; height: 100%;
margin: 0; padding: 0;
}