[ISSUE #592] formatting of error text in web ui is not very noticeable

[halalala222]

1. make error text more noticeable
   like :
   

[yohamta]

✨✨✨LGTM✨✨✨🚀, thank you very much!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.93%. Comparing base (6b14de2) to head (c7b65e2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #670   +/-   ##
=======================================
  Coverage   64.93%   64.93%           
=======================================
  Files          53       53           
  Lines        4284     4284           
=======================================
  Hits         2782     2782           
  Misses       1250     1250           
  Partials      252      252           

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