Gadget-editButton.css

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#wikiEdit {
	box-sizing: border-box;
	border-top-right-radius: 0;
	border-bottom-right-radius: 0;
	background: #e9edef;
	color: initial;
	border: 1px solid #c9c9c9;
	border-right: 0;
}

#wikiEdit button {
	cursor: pointer;
}

#wikiActions {
	border-top-left-radius: 0;
	border-bottom-left-radius: 0;
	font-size: 0;
}

#wikiEdit .fas {
	margin: auto 3px auto 0;
}

#wikiActions .fas {
	font-size: initial;
	margin-right: 0;
}

MediaWiki

Gadget-editButton.css