body {
    font-family: Arial, sans-serif;
    background: #f3f4f6;
    padding: 20px;
    text-align: center;
  }
  
  h1 {
    margin-bottom: 20px;
  }
  
  .container {
    margin-bottom: 20px;
  }
  
  input {
    padding: 10px;
    width: 200px;
    font-size: 16px;
  }
  
  button {
    padding: 10px 15px;
    font-size: 16px;
    cursor: pointer;
  }
  
  .result {
    background: white;
    padding: 15px;
    border-radius: 8px;
    width: 260px;
    margin: 0 auto;
    box-shadow: 0px 0px 6px rgba(0,0,0,0.1);
  }
  
  .hidden {
    display: none;
  }