<head>
  <link rel="stylesheet" href="main.css">
</head>
<body>

<h1>Hello World!</h1>

<h2>Lập trình từ đầu</h2>


body {
  background-color: lightblue;
}

h1,h2 {
  color: white;
  text-align: center;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.