my question is if it is possible to reset css styles (a lot off them) for a single div and all elements that are contained in that div.
I am asking, because I found
As mentioned previously @Noldorin, you want a selector that selects all descendants (or children) using the universal selector.
For more info on selectors, check out W3C's documentation. CSS2 selector info is here
Example code (i've chosen to use a selector by ID as opposed to class) to illustrate:
CSS Reset
With Descendant Reset Style
Red
GreenBlue
With Child Reset Style
Red
GreenBlue
Without Reset Style
Red
GreenBlue