I've taken the trouble to create new styles for headers and created a TOC. I click on a location in the TOC and it takes me to the header I want, but now I want to be able to go back to that part of the TOC. The TOC is 5 pages long. I created a bookmark at the relevant location in the TOC and created a hyperlink from the header back to the relevant location in the TOC.

When I click on the hyperlink of the header, it changes the color to the well known blue with an underline destroying my custom style. How can I change the color of the link that has been clicked, or keep it from changing at all?