Try it Editor

<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color: lightpink;
}

h1 {
  color: black;
  text-align: center;
}

p {
  font-size: 20px;
}
</style>
</head>
<body>

<h1>My First Webpage</h1>
<h3>About CSS</h3>
<p>CSS Stands for cascading style sheets. It is used to change the style(color, height, width, padding, margin, etc.) of the HTML element. By using CSS we can design a very good user interface for your website or web application.</p>

</body>
</html>