Border around browser viewport - with scrollbars inside

browserBorder.css

.page-wrapper {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	z-index: 700; /* must be the higher than all other elements */
	overflow: auto; /* moves scrollbars inside border */
	background: #fff;
	border: 5px solid #ff9900;
}

browserBorder.html

<div class="page-wrapper">
    <div class="page">
        Page content goes in here
    </div>
</div>