How did the fluther creators make this site fit perfectly on my iPhone?

It’s interface is the exact same size as my screen, perfectly formatted. How did they do this? Is there a way to re-format any website if you know what to do?

EDIT
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I mean how do they make it a smaller, more slimmed down version so it’s compatible so it doesn’t run slowly? iWamoto was showing off his site in a post and it looks very good on the iPhone.