.quiz {
  margin: auto;
  width: 600px;
  border: 3px solid green;
  padding: 10px;
  border-radius: 15px;
}

.navi {
  margin: auto;
  width: 600px;
  border: 3px solid green;
  padding: 10px;
  border-radius: 15px;
}

.question {
  margin: auto;
  height: auto;
  width: 500px;
  background-color: #F0FFFF;
  border: 2px solid green;
  padding: 10px;
}