body {
  text-align: center;
  font-family: system-ui, sans-serif;
  margin: 40px;
}

.panel {
  margin-bottom: 20px;
}

.number {
  font-size: 64px;
  font-weight: bold;
  height: 80px;
  margin: 20px 0;
}

.answer {
  margin-top: 20px;
}

input {
  font-size: 18px;
  width: 160px;
}