body {
  font-family: Arial, sans-serif;
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
}

.container {
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0px 4px 20px rgba(0, 0, 0, 0.1);
  text-align: center;
  width: 90%;
  max-width: 400px;
}

input {
  width: 100%;
  padding: 10px;
  margin-bottom: 15px;
  font-size: 16px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

#result {
  font-weight: bold;
  margin-top: 15px;
}