.itc-calculator {
  max-width: 420px;
  padding: 16px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-family: system-ui, sans-serif;
}

.itc-calculator h3 {
  margin-top: 0;
}

.itc-calculator input {
  width: 100%;
  padding: 6px;
  margin-top: 4px;
}

.itc-calculator hr {
  margin: 16px 0;
}