Not indicate correct answer when showing score at end of survey

Dear All,
I am here seeking for your precious advise!
I have a similar situation, and I tried using the HTML code mentioned above but it does not work : ( Perhaps something has changed in the last 5 years?... So my question is: "I've set up the survey as a multiple choice quiz. I would like students to know which questions they had wrong (because they can retake the entire quiz - although their questions may vary because they are a random selection from a block). When showing the score at the end though, for each question, the correct answer is in green and the incorrect answer they chose is shown in red. I don't want there to be an indication of what the correct answer is. It would be fine if all they saw was the question stem (and not the answer choices) and just whether they were correct or incorrect for that question.
Is there a way to do this?"
Thanks a lot....

I added the code below from previous answer to Look and Feel - Style - Custom CSS.
At the end of survey I can see the total points earned and points for each question (0/1 or 1/1 etc) but the correct answer isn't highlighted in green. Would be great to see the "0/1" in red as a quick visual to find which questions were missed. If anyone knows how to do that please share :)

.Skin .Grading .ChoiceStructure .Icon {
  width: 18px;
  height: 17px;
  float: left;
  margin-right: 5px;
  display:none;
}

.Skin .Grading .ChoiceStructure .Selected .Incorrect, .Skin .Grading .Incorrect {
  color: #bf8d8d;
}

.Skin .Grading .ChoiceStructure .Selected .Incorrect, .Skin .Grading .Incorrect {
  color: #000;
}
.Skin .Grading .ChoiceStructure .Incorrect {
  color: #000;
}
.Skin .Grading .ChoiceStructure .Selected {
  font-weight: 100;
}
.Skin .Grading .ChoiceStructure .Correct {
  color: #000;
}

.Skin .Grading .ChoiceStructure .Selected .Correct, .Skin .Grading .Correct {
  color: #000;
}