body {
  margin: 0;
  background-color: #0099cc; /* xanh nước biển */
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}

h1 {
  font-family: 'Pacifico', cursive; /* phông viết tay */
  color: white;
  font-size: 3rem;
  text-align: center;
  text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}