[JSWolf]

The chapter header is some pretty poor code. This is some much better code for the same thing. You can style h2 as you see fit. But as you see, the code for the chapter header is very clean and simple. Plus, if you want or need to generate a new ToC, this will let you do so very easily. Plus, I cannot stand links in the chapter header as I prefer to nuke the HTML ToC.

<h2>Chapter 4</h2>

h2 {
  text-align: center;
  text-indent: 0;
  font-weight: bold;
  margin-top: 0.8em;
  margin-bottom: 0.8em;
}