body {
  font-family: Arial, sans-serif;
  background: #f2f2f2;
  text-align: center;
  margin-top: 50px;
}

.container {
  background: #fff;
  padding: 20px;
  margin: auto;
  width: 400px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.2);
}

input {
  padding: 10px;
  width: 70%;
  margin-right: 10px;
}

button {
  padding: 10px 20px;
  cursor: pointer;
}

.result {
  margin-top: 20px;
  background: #e6ffe6;
  padding: 10px;
  border-radius: 5px;
}