<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  
  <h1>Hello Extend!</h1>
  <p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Odit, fugit commodi. Quo ipsam ipsa consequuntur inventore nostrum libero distinctio, reiciendis aspernatur labore porro consequatur cupiditate illo doloribus recusandae? Vel, et!</p>
  <h2>Goodbye</h2>
</body>
</html>
.heading {
  color: red;
  background-color: gold;
}

h1 {
  @extend .heading;
}

h2 {
  @extend .heading;
  text-align: center;
}
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