Board Thread:Support Requests - Designing Your Wiki/@comment-15745114-20191212221116/@comment-9605025-20191213035019

Looking at your wiki, it seems like you went ahead and disabled europa infobxes. However, just to provide an answer to your question, not necessarily. The europa theme, when enabled, simply adds the class  to the infobox along side all the other typical classes. Wikia then has a bunch of CSS rules in the global CSS that changes the base appearance of infoboxes with that class. Custom themes can still be applied and work more or less the same as if europa was not enabled. The one thing that does change is the required specificity of custom infobox CSS. If you don't know what CSS specificity is, don't worry about it. If you do care to know a little more, expand the rest of this reply. Show/Hide Wikia's europa CSS increases the required specificity by 1 class. All (or almost all) of the europa CSS rules use similar selectors as the non-europa CSS rules except that they are prefixed with. For those who don't pay attention to CSS specificity, this can give the appearance that custom CSS doesn't work. For example, the following is currently your first rule. This works for non-europa infoboxes because it has the same specificity as Wikia's global rule; which is as follows: However, when europa is enabled, additional rules get applied that have a higher specificity than the non-europa rules. Since your custom rules have the same specificity as the non-europa rules, this means the europa rules have a higher specificity than your custom rules as well and thus override the values you are trying to set. I am not sure what the exact rules are, but they would be something like this: Now, you could do the same thing as with the non-europa infoboxes and just match the selector exactly. This would mean you custom rule would change to be: The downside to this is that, if you disable europa at a later date, your custom CSS will no longer apply and Wikia's global non-europa rule will be applied. In order to get something that will work whether or not europa is enabled, you need to match the specificity but choose a selector that is applicable to both cases. My favorite way of doing this is to use the class. This class is assigned to the same part of the infobox as  but is present whether or not europa is enabled. As such, my custom CSS would be: