Update Ui.png and made red box thicker, so that it is more visible in Ui

[codecov[bot]]

Codecov Report

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

Comparison is base (b4f65c1) 80.19% compared to head (a54e186) 80.19%. Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #264 +/- ## ========================================= Coverage 80.19% 80.19% Complexity 977 977 ========================================= Files 136 136 Lines 2949 2949 Branches 351 351 ========================================= Hits 2365 2365 Misses 489 489 Partials 95 95 ```

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