How do I use internal css styles?

hoodedvul

An internal CSS style is used within the <head></head> tags of a html document.

There are countless examples on internet searches.

For example change the header tag style.

<h2>This is heading 2</h2>

Within the <head></head> tags.

...
<head>
  <style>
        h2 {
          background-color: pink;
          color: white
        }

    </style>
</head>
<body>
    <h2>This is heading 2</h2>
</body>

The result in the browser is: