MediaWiki:Common.css/.page-Main Page

/* CSS placed here will be applied to all skins */ body::before {

   content: ;
   position: fixed;
   top: 0;
   left: 0;
   width: 100%;
   height: 100vh;
   background: #cccccc;
   background-attachment: fixed;
   background-position: center;
   background-repeat: no-repeat;
   background-size: cover;
   z-index: -1;

}