body {
  font-family: sans-serif;
  margin: 0;
  padding: 20px;
}

.container {
  text-align: center;
}

.modes {
  display: flex;
  justify-content: space-around;
  margin-bottom: 20px;
}

button {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  margin: 5px;
}

#quiz-area {
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 5px;
  display: none;
}

#feedback {
  margin-top: 10px;
}

#results {
  font-weight: bold;
}

#next-question {
  display: none;
}