Whitespace changes

Tabs should consist of spaces. Do not make this mistake again!
Also add newline to the end of the file.
Change div to span

Changes the mushroom counter to a span.
Span is the preferred element for inline-items, I think.
Add rudimentary CSS

Fixes #2.
Adds some simple stylesheets to make the game look nicer.
Merge pull request #7 from stefan-brus/simpleCss

Simple css