Sass Writing Styles

## Description
Currently, Creative Commons does not have a Sass writing style though it follows a standard code style in all `.scss` files. This issue proposes finding and preparing a writing style from the `.scss` files present in this repository.

Please provide your suggestions on this idea.

## Implementation
- [x] I would be interested in implementing this feature.

Review the existing .scss files in the repository to identify the current standard code style. Prepare a proposed Sass writing style based on those files, then confirm that the resulting guidance covers the conventions consistently used across the repository.

Written by the indexing model from the issue text.