Refactor css dor dynamic dropdown

[hars-21]

What kind of change does this PR introduce?

Refactor css for drodown component

Issue Number:

Fixes #3332

Snapshots/Videos:

If relevant, did you update the documentation?

Summary

Transferred all existing to app.module.css file
Refactored CSS to make all the css in one global file
Updated source path

Does this PR introduce a breaking change?

No

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