.calculator {
  border: 1px solid #320270;
  padding: 0.5rem;
  margin: 0.5rem 0;
  border-radius: 4px;
}

.control {
  margin-bottom: 0.5rem;
}

.control label {
  display: block;
  font-weight: bold;
  font-size: 0.8rem;
}

.difference {
  display: inline-block;
  font-weight: bold;
  color: white;
  background-color: #5e0270;
  padding: 0.25rem;
  border-radius: 4px;
}