Difficulty with free guestbook and changing colours

This might seem a stupid or trivial question....

Have installed this marvellous guestbook and been using it for over 12 months... but I have this problem that everytime a new entries page is created in html to display on the site, the colours for the texts changes.

Normally I have a dark background and orange writing, once a new page is generated the writing goes to black, which I beleive is its default, I then edit the html page to correct it and upload back onto the site.

I cannot figure out what I need to change to keep my own colour scheme permanently.

If anyone can help would me much appreciated.