MediaWiki:Common.css

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.mw-body {
	position: relative;
	min-height: 100vh; /* full viewport height */
	background-image:
		linear-gradient(rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0.9)),
		url('/wiki/assets/bg.jpeg');
	background-size: cover;
	background-position: center;
	background-repeat: no-repeat;
}
body.page-Main_Page #firstHeading {
    display: none;
}