MediaWiki:Citizen.css

:root {
	--background-color-overlay: rgba(255,255,255,0.92)
}

:root.skin-citizen-dark {
	--background-color-dp-00: #111111;
	--background-color-dp-08: #222222;
	--background-color-overlay: rgba(9, 10, 12, 0.95);
}

html {
	background: linear-gradient(0, var(--background-color-overlay), var(--background-color-overlay)), url(https://minecraft.rtgame.co.uk/assets/images/bg.jpg);
	background-position: center;
	background-size: cover;
	background-repeat: no-repeat;
	background-attachment: fixed;
}

body {
	background: none;
}