[frontend] Improve Simulation buttons CSS (#8231)

[lndrtrbn]

Proposed changes

• Fix horizontal scrollbar issue
• Improve buttons display to have better hover

Related issues

• UI Regression : horizontal scrollbar on details page #8231

Checklist

• I consider the submitted work as finished
• 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)
• Where necessary I refactored code to improve the overall quality

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.14%. Comparing base (26d2128) to head (ca6e1b0).
Report is 29 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8232      +/-   ##
==========================================
+ Coverage   66.13%   66.14%   +0.01%     
==========================================
  Files         597      597              
  Lines       59927    59927              
  Branches     6150     6152       +2     
==========================================
+ Hits        39634    39641       +7     
+ Misses      20293    20286       -7     

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