Support for `graphs.css`

[AnubisNekhet]

Checklist

Please replace the space inside the brackets with an x if the following items apply:

• I've verified that I use the latest version of the add-on by redownloading it from AnkiWeb
• I've checked if anyone else suggested this feature before by looking through the issue reports.

What Anki version are you using?

*Please open Anki, go to Help → About (windows) or Anki → About Anki (mac) to find the version. Edit the value between the backticks below

2.1.58

Problem case

Essentially the same request as #47

Solution

Performing the same task that was done in #47

Concisely describe alternatives you've considered (if any)

More information