[openstreetmap-website] Mobile fixes (#202)

[Saman Bemel-Benrud]

This pull requests makes maps pannable/zoomable on Opera mobile and introduces a few more minor fixes to the site mobile layout.
You can merge this Pull Request by running:

  git pull https://github.com/samanpwbb/openstreetmap-website mobile-fixes

Or you can view, comment on it, or merge it online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/202

-- Commit Summary --

  * fixing mobile map + other minor mobile adjustments.
  * fix overflow on login page on mobile.

-- File Changes --

    M app/assets/stylesheets/small.css.scss (19)
    M app/views/user/login.html.erb (6)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/202.patch
https://github.com/openstreetmap/openstreetmap-website/pull/202.diff

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