[openstreetmap-website] Only show scrollbars if needed in markdown input (#277)

[Leo Koppelkamm]

You can merge this Pull Request by running:

  git pull https://github.com/DieBuche/openstreetmap-website overflowscroll

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

  https://github.com/openstreetmap/openstreetmap-website/pull/277

-- Commit Summary --

  * Only show scrollbars if needed in Markdown input

-- File Changes --

    M app/assets/stylesheets/common.css.scss (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/277.patch
https://github.com/openstreetmap/openstreetmap-website/pull/277.diff

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