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

[Tom Hughes]

Pushed 4a26107560d5115bdebb40c8fc180e421314f977 based on @jfirebaugh's `text-indent` idea.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10661788
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