HTML help: How to change scroll bar?

Http://www.apple.com/iphone-5s/
How do you change the scroll bar so it would look like the one on apple's webpage? Not just look the same, but function the same as well. Very much appreciated! Thanks in advance!

Added (1). I don't know anything about CSS or javascripting yet though.

Contents are larger than the visible window area (a scrollbar will appear on the right).
A textarea contains enough text so that scrollbars appear.
An iframe is used to display a different page.
A div or any other block element has its overflow property set.

.container {
width: 400px;
height: 300px;
background-color: #DCDCDC;
overflow: scroll; /* showing scrollbars */
}

Internet Explorer Has its Own Scrollbar Styling.
in fact IE was the first browser to ever support styling of scrollbars through CSS. This was back in the days of IE 5.5, but only the color can be changed.

These properties can still be used today; take a look at this single property on IE 9 for demonstration purposes:
body {
scrollbar-face-color: #b46868;
}

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