Figma: Refactor CSS files in src/components/EventStats

[palisadoes]

Introduction

To improve the UI/UX of Talawa-Admin we have been working on:

1. making the application more suitable to color blind users
2. streamlining all CSS into a single global file

Post a video of your work in the PR

1. This is important for reviewers to understand the solution
2. Pay attention to the Additional Information below.

Additional information:

1. The foundational work for this was completed in this PR:
   • Chore/css changes #2466
2. When in doubt about colors, take cues from other similar elements in this file and the PR mentioned in the issue.
   1. https://www.figma.com/design/dmKt00m9GVSeA1nebnkxql/Untitled?node-id=0-1&node-type=canvas&t=TPzfh1DE9IxjzsEe-0
3. The desired single CSS file is:
   1. src/style/app.module.css
      1. Convert all code files to use this file.
      2. Delete all CSS files in this code path and below mentioned in the title. The src/style/app.module.css file must be the only source of CSS
4. Use no CSS in:
   1. assets/css/app.css
5. Use variable names that describe the function of the color and not the color itself. This will help with future attempts to having Dark Mode.
   1. For example --search-button-bg is much better than --light-blue
   2. NoMongo: Fix Stylesheet in Anticipation of Dark Mode #3296
6. When refactoring modals, please refer to this PR that has created a standardized design patter for them.
   1. Updating to NEW COLOR SCHEME #2984
7. Remove all references to HTML color codes in the files you edit except in src/style/app.module.css
8. Buttons, and dropdowns must only have shadows when there is a mouse hover. Their color must not change
9. Search boxes must only have shadows when selected

The challenge:

The goal is to convert the CSS file in this subdirectory and all the components related to this screen to use this new design pattern. This means that:

1. All CSS files in this subdirectory and all the CSS files in related components must be merged into the global CSS file using pre-existing CSS.
2. All CSS files in this subdirectory and all the CSS files in related components must be deleted after the merge.
3. The remaining relevant files in this subdirectory must only reference the global CSS file.
4. All the CSS files in the related components of this subdirectory must adhere to the same guidelines.
5. Use variables for your CSS wherever possible. There may be predefined colors that you can use.

[ujjuishere]

@palisadoes , can i be assigned this isssue to me ?

[palisadoes]

1. This issue needs to be closed in favor of the comprehensive approach outlined in this issue
   1. NoMongo: Fix Stylesheet in Anticipation of Dark Mode #3296
2. If you wish to participate in the resulting PR, please the assignees to include you when it is sumbitted.
3. Coordination is planned in the #talawa-projects channel