When you get odds as like 8.80, which surely shows that Croatia will be underdogs in this match and Brazil will go as the favorite in the match. For sure, there will be the pressure of a Quarterfinal and I think the team who scores first, will get an enormous advantage in the knockout match.
If you consider the team Croatia is up against, you will be less tempted to choose Croatia to win against Brazil despite the attractive odds. The possible chance of Croatia winning over Brazil is slim and it is not possible to come by.
While football can be unpredictable and surprising, none of the aforementioned scenarios are likely to occur in this instance(Croatia, and Brazil match). I believe Brazil will defeat Croatia by a score of 3 goals to 1.