That six-digit number is what determines the header font's color, so changing the number will alter the display. This article's resource section includes a link to common HTML color codes.

Even if you are not a professional website builder, there are times when you need to edit text in HTML. Here we give hints on how to change the color of text in a document in this common markup ...

However, in some situations, such as having a header image with your business's name or logo designed in or simply not wanting to display text in the header at all, you may want to disable this text.