Forcing a single page or use a full-page background

If you want to make a container that will always take an entire page, no more, no less, you can define it like so:
CSS
.page {
/* Defining an A4 portrait page */
height: 1120px;
width: 793px;
/* Will prevent any content like large images from messing */
/* with printed content auto-scaling */
overflow: hidden;
/* Will allow any absolutely positionned content to be */
/* placed relatilvely to the page by default */
position: relative;
}
You can then use it in your HTML
HTML
<div class="page">
Content for a single page
</div>

If you want to apply a background so it takes the entire page, use the technique above and set the background image on your page:
CSS
.page-with-bg {
background-image: url('some-background-url-or-datauri');
background-size: cover;
}
HTML
<div class="page page-with-bg">
Content for a single page
</div>
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On this page
Forcing content to fit on a single page
Using a full-page background