All these issues can be resolved by the use of a free Firefox extension called Web Developer.
There is something similar for IE, but I don't use it.
In the Web Dev toolbar, select Information --> Display Element Information and click on the desired element, Web Dev displays what it is and then you can manipulate it via CSS.
In this case the element is h3 #categoriescssHeading .leftBoxHeading.
You can use either the main stylesheet in your custom template folder or the categoriescss stylesheet and set the font value to ffffff.
However, this question is very strange, because the box title does not hover, and is usually set to white.
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