1. all: unsethttps://developer.mozilla.org/en-US/docs/Web/CSS/unset unset - CSS: Cascading Style Sheets | MDNThe unset CSS keyword resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not. In other words, it behaves like the inherit keyword in the first case, when the property is an inherited prodeveloper.mozilla.org  all: unset..