[openstreetmap-website] Strange + and - characters on zoom controls (#164)

[Shaun McDonald]

http://37signals.com/svn/posts/3126-another-9999px is another explanation and slight variation.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10662056
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