body {
  font-family: Arial;
  background: #f4f4f4;
}

.container {
  max-width: 400px;
  margin: 40px auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
}

.row {
  display: flex;
  gap: 10px;
  margin-bottom: 10px;
}

input {
  width: 100%;
  padding: 8px;
}

button {
  width: 100%;
  margin-top: 10px;
  padding: 10px;
  cursor: pointer;
}

.result {
  margin-top: 20px;
  font-weight: bold;
}