Quiz and CSS variables

Hello,

I am wondering where I could find an exhaustive list of CSS variables suitable to be used.

For example, mlw_qmn_new_question does NOT appear in :

https://quizandsurveymaster.com/docs/advanced-topics/editing-design-styles-css/

I found it by chance in some post in this forum.

Thank you for your time,
Hoping you can help.

Adren