body {
  font-family: Arial, sans-serif;
  background-color: #f5f5f5;
  margin: 0;
  padding: 0;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 10px;
  box-shadow: 0px 4px 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  color: #333;
}

input, button {
  padding: 10px;
  margin: 10px 0;
  width: 100%;
  font-size: 16px;
  border-radius: 5px;
  border: 1px solid #ccc;
}

button {
  cursor: pointer;
  background-color: #4CAF50;
  color: white;
  border: none;
}

button:hover {
  background-color: #45a049;
}

.output {
  margin-top: 15px;
  padding: 10px;
  background-color: #e9e9e9;
  border-radius: 5px;
  min-height: 40px;
  font-weight: bold;
  color: #333;
}