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; 
  }