Gadget-skinsandbox.css

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body.page-Dogcraft_Wiki_Skin_sandbox {
	background: #f1f1f1;
	background-image: url('https://dogcraft.net/img/bg/17391Spawn.png');
	background-attachment: fixed;
	background-size: cover;
}

.page-Dogcraft_Wiki_Skin_sandbox #p-cactions {
	border: 5px var(--main-color) double;
	border-radius: 15px;
	background: white;
	margin-top: 1.875rem;
	padding-top: 0.46875rem;
	padding-bottom: 0.9375rem;
}

.page-Dogcraft_Wiki_Skin_sandbox footer {
	color:white;
}

MediaWiki

Gadget-skinsandbox.css