body {
  font-family: Arial, sans-serif;
  text-align: center;
  margin: 20px;
}

h1 {
  margin-bottom: 40px;
}

#base-question {
  margin-bottom: 30px;
}

.base-button-container {
  margin-top: 40px;
  margin-bottom: 40px;
}

#base-submit,
#base-next {
  font-size: 20px;
  padding: 15px;
  margin-left: 5px;
  margin-right: 5px;
  cursor: pointer;
}

#base-submit:disabled,
#base-next:disabled {
  cursor: default;
}

.base-result {
  min-height: 30px;
}

.base-result.correct {
  color: green;
}

.base-result.incorrect {
  color: red;
}

#base-back-link {
  margin-top: 40px;
  display: inline-block;
  text-decoration: none;
  color: #007BFF;
}

#base-back-link:hover {
  text-decoration: underline;
}