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

[John Firebaugh]

One possible fix is:

```
.leaflet-control-zoomslider-in,
.leaflet-control-zoomslider-out {
  text-indent: -9999px;
}
```

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/164#issuecomment-10661507
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