body {
    display: flex;
    flex-direction: column;
    align-items: center;
    height: 100vh;
    margin: 0;
    font-family: Arial, sans-serif;
    color: #000;
    background-color: #f0f0f0;
  }
  
    #container {
      text-align: center;
      margin-top: 20px; 
    }
    .hello-world {
      margin: 10px 0;
      font-size: 24px;
    }
    button {
      margin: 5px;
      padding: 10px 20px;
      font-size: 16px;
      cursor: pointer;
      background-color: #61dafb;
      border: none;
      border-radius: 5px;
      color: #fff; 
      transition: background-color 0.3s ease;
    }
    button:hover {
      background-color: #21a1f1;
    }
    h1 {
      color: #000; 
    }