[openstreetmap-website] Set color & background-color in searchbox (#883)

[Thomas Rupprecht]

This is how it looks like in Ubuntu Gnome - dark theme
![searchbox_osm](https://cloud.githubusercontent.com/assets/1078640/5983590/022f8f40-a8cf-11e4-9955-e2ddc72bb41f.png)




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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/pull/883#issuecomment-72273014
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