How to define a page's size on HTML5?

I'm making a webpage for my iPhone's lock screen. I want to see the page realsize on my computer, so I can get the spacing and stuff right. How can I define my page's height and width?

I know it's pretty basic but I haven't found anything useful after ten minutes searching and guessing. I'm used to HTML4, I've only started learning HTML5 and JavaScript today for this project.

Added (1). If someone could just give me the tag or attribute…
I got 'round the problem by making a 960x640px picture and setting it as the (non-repeating) background, but I'd still like to know the code for future use.

Mobile Website:

320 and Up - The 'tiny screen first' responsive boilerplate: http://stuffandnonsense.co.uk/projects/320andup/
Responsive Navigation Patterns: http://bradfrostweb.com/blog/web/responsive-nav-patterns/

5 Stunning and Usable Mobile Website Designs: http://designfestival.com/5-stunning-and-usable-mobile-website-designs/
Learn the Mobile Web: http://learnthemobileweb.com/2009/07/mobile-meta-tags/
10 Ways the Mobile Web is Different: http://www.elated.com/articles/10-ways-the-mobile-web-is-different/
Redesigning a Site For Mobile: What's Involved?: http://www.elated.com/articles/redesigning-a-site-for-mobile-whats-involved/
Make Your WordPress Website Mobile-Friendly in Minutes: http://designfestival.com/make-your-wordpress-website-mobile-friendly-in-minutes/

How to Validate & Test Your Designs for the Mobile Web: http://designfestival.com/how-to-validate-test-your-designs-for-the-mobile-web

Web Mobile Browser Shots: https://browshot.com/

How to Centre and Layout Pages Without a Wrapper: http://camendesign.com/code/developpeurs_sans_frontieres

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