body {
      font-family: Arial, sans-serif;
      background-color: lightyellow;
      padding: 40px;
    }

    p {
      font-size: 18px;
    }

    input[type="text"] {
      padding: 8px;
      width: 200px;
      border: 2px solid gray;
      border-radius: 5px;
      font-size: 16px;
    }

    button {
      padding: 8px 16px;
      background-color: green;
      color: white;
      border: none;
      border-radius: 5px;
      font-size: 16px;
      margin-left: 10px;
      cursor: pointer;
    }

    button:hover {
      background-color: darkgreen;
    }

    #p01 {
      color: red;
      margin-top: 10px;
      font-weight: bold;
    }