
      margin: 0;
      background-color: #f4f4f9;
      color: white;
    }
    h1 {
      font-size: 2.5rem;
      margin-bottom: 0.5rem;
    }
    p {
      font-size: 1.2rem;
      color: rgb(230, 238, 252);
    }
  </style>
</head>
<body>
  <h1>Your app is running!</h1>
</body>
</html>