First of all, thank you for the bootstrap classes. I don't know much about bootstrap so pretty much all of my coding is done by hand, both CSS and HTML.
However... I don't think you quite understand my suggestion or the problem I'm facing. I'll clarify.
CSS is doing the majority of my styling, yes, but there is specific html coding that I want to have on all pages (including forum, joining page, etc) of my guild that aren't available currently, due to not being able to add custom html code.
For example, this is my home page: https://toyhou.se/~world/27854.xiunus (Notice that it's got two versions of the custom navigation currently, one from the Bulletin and one from the home page, since I want people to be able to see the custom navigation even when looking at bulletins alone.) The current (non-bootstrap) floating navigation is custom html and CSS that I coded.
I've tossed that code onto all of my Pages. (See: https://toyhou.se/~world/27854.xiunus/page/4107.immigration )
I can't do that on the forum (https://toyhou.se/~world/27854.xiunus/forums) or the joining page, which I get might be because it's usually just pulled up on the screen when you hit "join" (https://toyhou.se/~worlds/request-membership/27854)
After doing so I realized that I wanted the Transfers link to be a thread on the forum instead of a page, and, forgetting that it was in the footer, deleted the original Transfers page. Now, every single one of my pages has a broken "Transfers" link. With the current setting of not having custom global html we can use, I will have to go through every. single. one. of my pages to fix the error. Were there to be some custom html that is global across pages (including forum, etc, god please) I would only have to edit the one thing.
Also having those custom html bits could allow for an additional div cushioning around my content, such as the one I have currently named "continent" in my pages, without needing to add potentially messy looking code to every single page.
Just like how premium users can make css sheets on their accounts and simply have a line to include it elsewhere (and, as I've just learned, have "Global Characters Blurbs" that put certain HTML to all character pages), I want there to be a similar functionality for html in Worlds.
(Also, this isn't me trying to advertise my world, it's Super unfinished, )