How to add internal css in html page?

Start style tag after title tag closes.

First of all select style type, then select text/css and then add css and after adding css,close style tag.

<title>developer</title>
<style type="text/css">
your inline css
your inline css
your inline css
your inline css
your inline css
</style>
 and thats all.Add css in between style tag.