Board Thread:Support Requests - Designing Your Wiki/@comment-45171933-20200316222155/@comment-44807868-20200317042244

What do you mean by "smaller"? Do you want to decrease the width? Decorate them how exactly? You'd get better help with being more specific, but Help:Infoboxes/CSS might help you!

And that wiki's Wikia.css was created by an administrator and then they blanked it. There's no unusual behavior in that. Wikia.css simply is for locally customizing appearance of different aspects of the wiki, so blanking it doesn't really effect backbone of the wiki nor anything else.