[frontend] fix download files + some css issues (#9099)

[lndrtrbn]

Proposed changes

• fix some css issues
• fix download pdf in content tab

Related issues

• 9099

Checklist

• [x] I consider the submitted work as finished
• [x] I tested the code for its functionality
• [ ] I wrote test cases for the relevant uses case (coverage and e2e)
• [ ] I added/update the relevant documentation (either on github or on notion)
• [x] Where necessary I refactored code to improve the overall quality

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.69%. Comparing base (a0a5121) to head (a9b3925). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #9100 +/- ## ======================================= Coverage 64.69% 64.69% ======================================= Files 620 620 Lines 59210 59210 Branches 6523 6520 -3 ======================================= Hits 38303 38303 Misses 20907 20907 ```

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