Enable css adressing for viewer buttons

Description

For better layout possibilities in application we need to adress buttons with explicit css classes. Looking at MIR for example, in embedded mode the fullscreen icon needs some space to right. This is hard to fix atm:

https://github.com/gbv/reposis_repper/commit/7f26758b9bb030f22c647e7f125d889ed4bf6f0d

Environment

None

Assignee

Sebastian Hofmann

Reporter

Kathleen Neumann

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URL

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External issue ID

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Fix versions

Affects versions

Priority

Medium
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