lkorlapu We are working on an article around the usage of CSS in Aurora. To give a snapshot answer, we are not allowing full CSS styling overrides. It will be possible to style using PostCSS on custom components and include custom stylings that way.
We have a Theme JSON with existing styling variables that can be customized in the Dev Tools feature. (check with your account team to ensure you have Dev Tools purchased)
We have multiple themes planned on the roadmap also, which will allow you to create multiple themes and configure them in the UI and in the JSON files in the GitHub repository.
