Wikipedia CSS (for vector theme) that makes things look super modern and awesome.

vector.css

@import url(//fonts.googleapis.com/css?family=Open+Sans:400,700,400italic,700italic);

body {
	background-color: white;
	font-family: 'Open Sans', sans-serif;
}

#content {
	width: 700px;
	margin-top: 50px;
	margin-left: auto;
	margin-right: auto;
	border: none;
}

#firstHeading {
	text-align: center;
	border: none;
	font-family: 'Open Sans', sans-serif !important;
	font-size: 35px !important;
	font-weight: 700 !important;
}

.mw-indicators {
	position: absolute !important;
}

#siteSub {
	text-align: center;
}

.hatnote {
	padding-left: 0px !important;
}

h2 > .mw-headline {
	font-family: 'Open Sans', sans-serif !important;
	font-size: 27px !important;
	font-weight: 700 !important;
}

h2 {
	margin-top: 45px !important;
	border-bottom: none !important;
}

h3 {
	margin-top: 25px !important;
}

h4 {
	margin-top: 20px !important;
}

h5 {
	margin-top: 20px !important;
}

p {
	margin-top: 15px !important;
	font-size: 15px;
	line-height: 160%;
	/* text-align: justify; */
}

.mwe-popups {
	font-size: 15px;
	line-height: 160%;
}

li {
	font-size: 15px;
	line-height: 160%;
}

#mw-page-base {
	background-image: none;
}

.infobox {
	/* position: absolute; */
	/* top: 0px; */
	/* left: 100%; */
	margin-left: 25px !important;
	/* margin-right: 25px !important; */
	/* right: 100%; */
	border: none !important;
	background-color: white !important;
}

.navbox,
.vertical-navbox,
.catlinks {
	border: none !important;
	background-color: white !important;
}

.ambox {
	position: absolute;
	margin-left: 105% !important;
	width: 280px;
	background-color: white !important;
	border-color: #EEE !important;
}

.metadata {
	display: none;
}

.thumbinner {
	background-color: white !important;
	border: none !important;
	padding-top: 13px !important;
}

.quotebox {
	background-color: white !important;
	border-top: none !important;
	border-left: none !important;
	border-right: none !important;
	margin-left: 25px !important;
}

.quotebox p {
	margin-top: 0px !important;
}

.wikitable {
	background-color: white !important;
}

.wikitable > tr > th,
.wikitable > tbody > tr > th {
	background-color: #F9F9F9 !important;
}

#p-navigation,
#p-interaction,
#p-tb,
#p-coll-print_export,
#p-wikibase-otherprojects,
#p-lang {
	display: none;
}

#p-logo {
	transform: scale(0.75);
}

#p-views {
	background-image: none;
}

#p-views > ul > li {
	background-image: none;
	background-color: white;
}

#p-views > ul > li > span {
	background-image: none;
}

#p-namespaces {
	background-image: none;
}

#p-namespaces > ul > li {
	background-image: none;
	background-color: white;
}

#p-namespaces > ul > li > span {
	background-image: none;
}

#p-cactions {
	display: none;
}