.instructions {
  text-align: center;
  font-size: 18px;
  padding-left: 200px;
  padding-right: 200px;
  display: none;
}

.example{
  text-align: center;
  font-size: 18px;
  padding-left: 150px;
  padding-right: 150px;
  display:none;
}

.quiz{
  text-align: center;
  font-size: 18px;
  padding-left: 200px;
  padding-right: 200px;
  display: none;
}