Thread:Kusuo1412/@comment-171752-20171129182002

If you look at their MediaWiki:Wikia.css, you'll see the CSS code they're using for the background images on those modules. Look for the code at these sections:

/* Chat */ /** Main module **/

and

/* Community page */

and the last block of code under

/* Discussion Module */

If you have any trouble, I would suggest contacting Roranoa Drake II, who added that CSS for the One Piece Wiki. 