MediaWiki:Fandomdesktop.css

/*Background*/ .theme-fandomdesktop-light .main-container { background: #000 url(https://static.wikia.nocookie.net/jujutsu-kaisen/images/5/50/Wiki-background) no-repeat center top; background-attachment: fixed !important; background-size: cover; background-position: center; background-color:#000000; }