New Upgrade Plan : Migrate Old CSS files into SCSS.

New Upgrade Plan : Migrate Old CSS files into SCSS.
- using variables (preferable)

No files, tests, or entry points are named, so begin by locating the old CSS files and checking how they are included by the HTML and JavaScript. Migrate the identified CSS files to SCSS, using variables where appropriate; done means the site retains its existing styling with the old CSS replaced.

索引モデルが issue の本文から書いたものです。