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

[Anton]

![image](https://user-images.githubusercontent.com/518939/75429033-ce80ec00-5951-11ea-9697-d40eb74d4f6d.png)

but it seems to me when any block is open, not the menu, the shadow looks necessary, which separates the header from the block with additional content

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