Add CSS Classes (#392)

[ganti]

• Adding this classes allow to overwrite the layout in a more efficient way
• Also this fixes a small display bug. For long texts, the entity-table grew so big that the layout exploded, therefore I removed whitespace-nowrap in commit cc8552e

Closes #392

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ad99d01) 92.47% compared to head (d161298) 92.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #394   +/-   ##
=======================================
  Coverage   92.47%   92.47%           
=======================================
  Files          15       15           
  Lines         359      359           
=======================================
  Hits          332      332           
  Misses         27       27           

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[DamienHarper]

@ganti thanks for the contrib!