Hi! If you search in chatter, something like: "free css" or "f2u css" a bunch of threads should pop up with free to use css you can put on your den page.

Here's a few examples:
https://www.lioden.com/topic.php?id=304429527797
https://www.lioden.com/topic.php?id=304429524447

As to how you use them..
When you find a den page you like and want to use, you need to copy it's code. The code is usually put beneath the image example, or there's a link that'll take you to it. When you have the code, you copy it and paste it into your den description under "Edit your details". After you save and refresh the page, your den should be changed!

OBS: A lot of codes will have '*' in them, you need to delete these from the code, for it to work on your den page

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