MediaWiki:Common.css

/* CSS placed here will affect users of the Tweeki skin */
.page-Welcome {
    background-image: url(https://christianpedia.site/images/3/37/Main_page_background.jpg);
    background-repeat: no-repeat;
    background-size: 100% auto;
}
/* Media query for mobile devices */
@media screen and (max-width: 767px) {
    .page-Welcome {
        background-size: auto 94vh; /* Ensure full coverage on mobile devices */
    }
.mainpage {
    max-width: 95%;
}
}
body.page-Welcome .overlay-enabled, body.page-Welcome .mw-body {
    background-color: #ffffff;
    background-image: url(https://christianpedia.site/images/3/37/Main_page_background.jpg);
    background-repeat: no-repeat;
    background-size: 100% auto;
}