(First and foremost, I'm sorry if this is the wrong place to put this!!)

Here's what you need to do it (other than the CSS), it's an extension for the following browsers;

Google Chrome (pretty sure opera can also use the chrome extension) | Firefox

After you install, click the Extension icon on your browser's address bar > Manage

In the "Actions" area is a button that says "Write new style"

Click that and paste your den's CSS (not the URL) into the box
Below the box is an area that says "Applies to Everything"

Press the plus sign, change URL to "URLs on the domain" and type in lioden.com

Title it and press save.
Navigate back to Lioden and it should be applied

As a side note if you don't want it showing up on territory pages (cause I like seeing other people's CSS) you can turn it off by going to your den > click on the Stylus icon in the address bar > press the three dots and tick "Exclude the current URL"


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If you don't have a custom CSS and you still want to play with this, I made a Night theme one that you can even use in your den if you want.
https://dl.dropbox.com/scl/fi/gp232wrqbbs0dr1eagl3f/F2U.CSS?rlkey=uylt2mhq3qznbgm2e07vxhekb&dl=0

to use it in your den paste this in your Territory description;


To use it with Stylus, go to the link and paste everything into a new style


It does have one flaw that I've noticed (if you find more feel free to post it here), when browsing forum posts the text is really small. I figured out how to fix it but it's very time consuming so I only fixed the main page. Actual forum posts should be fine though.
(currently has a flaw in explore, be sure to turn it off when exploring for now and I'll fix it when I get home on Sunday.)