Fix printing behaviour in Chrome

This small PR fixes a giant bug, reported at #3445

1. The border is removed by adding adding `border:none`.
2. I've added `overflow:visible` to `#viewContainer`, which solves two problems:
   - It prevents scrollbars from appearing.
   - Every "page" is automatically resized to fit on a printed page, just like the Firefox.

Before this fix, "Chrome's print to PDF" feature resulted in: https://robwu.nl/pdfjs/pdfjs-print-with-chromium-28.pdf
After this fix, the Print-to-PDF feature results in a file which looks similar to the original file.

The initial commit fixes only the styling issues. All pages still have to be pre-rendered before printing, this needs to be implemented in a separate commit/PR, and will probably require more discussion and review because rendering all pages at once will probably cause a performance hit.