[openstreetmap/openstreetmap-website] add box shadow for header in mobile (#2535)

[Anton]

before:
![image](https://user-images.githubusercontent.com/518939/74449701-98d60080-4e85-11ea-8674-4f330edfe511.png)
not see what open main menu.

after:
![image](https://user-images.githubusercontent.com/518939/74449631-7e9c2280-4e85-11ea-8ceb-1b3b09e155bc.png)
![image](https://user-images.githubusercontent.com/518939/74449658-8a87e480-4e85-11ea-8ba7-44a9350b10b9.png)

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/2535

-- Commit Summary --

  * add box shadow for header in mobile

-- File Changes --

    M app/assets/stylesheets/small.scss (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2535.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2535.diff

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