body {
  font-family: 'Segoe UI', sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  text-align: center;
}

input, select, button {
  margin: 10px;
  padding: 10px;
  width: 200px;
}

#result {
  font-size: 20px;
  font-weight: bold;
  margin-top: 20px;
  color: green;
}