Only the lastest page shows the background changes :(

[Penumbra]

The latest page of our comic displays the background changes we've made, however if you go back a page it just seems to go back to the default and left align itself again. Do I need to edit something other than the indextemplate.html file?
(if I haven't explained myself very well take a look here)
http://penumbra.comicgenesis.com/

[Penumbra]

Hmm.. also the colour changes don't show up in firefox but show up in ie, why?

[Oualawouzou]

Editing indextemplate.html will change only your index page.

To modify archived comics pages, edit dailtytemplate.html.

[KittyKatBlack]

The latest page of our comic displays the background changes we've made, however if you go back a page it just seems to go back to the default and left align itself again. Do I need to edit something other than the indextemplate.html file?
(if I haven't explained myself very well take a look here)
http://penumbra.comicgenesis.com/

As stated earlier, the indextemplate.hmtl is only for the index.html (Your front page). the dailytemplate.html file is for all your archived pages.

Hmm.. also the colour changes don't show up in firefox but show up in ie, why?

It has to do with the way IE and Firefox read hex code. It's strange, but IE reads hex code either like, 'color=(#000000)' OR color=(000000)', where as Firefox will only read color as 'color=(#000000)'. So, just make sure you have the #'s in front of your numbers and that should fix the problem.