A discussion on "classes vs IDs":
https://stackoverflow.com/questions/12889362/difference-between-id-and-class-in-css-and-when-to-use-it
When is using
!important
okay? =>
https://css-tricks.com/when-using-important-is-the-right-choice/
The
:not()
pseudo class:
https://developer.mozilla.org/en-US/docs/Web/CSS/:not
Can I Use:
https://caniuse.com/