Increased the size of the page to allow for more seed point positions

This fixes the "small" height entropy window, because the JS doesn't detect the mouse points outside of the ```body``` tag's content height.

So if the page content is only 50% of the screen's height, you can only use 50% of the available height entropy to generate random seed points.

This commit makes the ```html``` and ```body``` tags have a set height of ```100%``` and fixes this minor issue.