Make images at full size when hover on it. Used in Stylus/Stylish.

imageborders image conent.css

@-moz-document domain("gelbooru.com"), domain("konachan.com"), domain("danbooru.donmai.us"), domain("yande.re"), domain("chan.sankakucomplex.com"), domain("zerochan.net"), domain("idol.sankakucomplex.com"), domain("sakugabooru.com") {
#image, #fullsize img {
	transition: .15s ease-in-out;
}
/* Gelbooru, Danbooru, Konachan, Sankakucomplex, yande.re, Sakugabooru */
#image:hover, #gelcomVideoPlayer:hover, #post-view video:hover {
	position: fixed;
	top: 1px;
	left: 226px;
	max-height: unset !important;
	max-width: unset !important;
	height: calc(100vh - 1px) !important;
	width: calc(100vw - 244px) !important;
	object-fit: contain;
	z-index: 5;
}
/* Zerochan on page and full size */
#large img:hover {
	position: fixed;
	top: 1px;
	right: 500px;
	max-height: unset !important;
	max-width: unset !important;
	height: calc(100vh - 3px) !important;
	width: calc(100vw - 518px) !important;
	object-fit: contain;
	z-index: 5;
}
#fullsize img:hover {
	position: fixed;
	top: 1px;
	left: 1px;
	max-height: unset !important;
	max-width: unset !important;
	height: calc(100vh - 1px) !important;
	width: calc(100vw - 19px) !important;
	object-fit: contain;
	z-index: 5;
}
}