Description:
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This is a followup to https://bugs.php.net/bug.php?id=63242 where I provided a patch to have html5 syntax and simpler html/css to the 404 page

The 404 page uses styles that were copy/pasted from a 2002 commit for phpinfo styling. It looks amateurish, title and text are not aligned, the blue background sticks to the title text and it depends partly on the browser default html rules, which means that there are differences in display across browsers for that page.

I propose a slight change of the css used that will result in something a bit leaner while keeping the same blue colour that represents PHP, here is a before/after screenshot:
http://chevrel.org/images/phpbugs/bug63242v2_compare.png

This is a simple patch that passes all tests, I will attach it here later today.