github.css

body {
				font-family: -apple-system, BlinkMacSystemFont, Helvetica, arial, sans-serif;
				font-size: 16px;
				line-height: 1.6;
				padding-top: 10px;
				padding-bottom: 10px;
				background-color: white;
				padding: 30px;
			}

			body > *:first-child {
				margin-top: 0 !important;
			}

			body > *:last-child {
				margin-bottom: 0 !important;
			}

			a {
				color: #0366d6;
				text-decoration: none;
			}

			a.absent {
				color: #cc0000;
			}

			a.anchor {
				display: block;
				padding-left: 30px;
				margin-left: -30px;
				cursor: pointer;
				position: absolute;
				top: 0;
				left: 0;
				bottom: 0;
			}

			h1, h2, h3, h4, h5, h6 {
				margin: 20px 0 10px;
				padding: 0;
				font-weight: bold;
				-webkit-font-smoothing: antialiased;
				cursor: text;
				position: relative;
			}

			h1 tt, h1 code {
				font-size: inherit;
			}

			h2 tt, h2 code {
				font-size: inherit;
			}

			h3 tt, h3 code {
				font-size: inherit;
			}

			h4 tt, h4 code {
				font-size: inherit;
			}

			h5 tt, h5 code {
				font-size: inherit;
			}

			h6 tt, h6 code {
				font-size: inherit;
			}

			h1 {
				font-size: 2em;
				line-height: 1.25;
				color: black;
				border-bottom: 1px solid #eaecef;
				padding-bottom: .3em;
				margin-bottom: 16px;
			}

			h2 {
				font-size: 1.5em;
				line-height: 1.25;
				color: black;
				border-bottom: 1px solid #eaecef;
				padding-bottom: .3em;
				margin-bottom: 16px;
				margin-top: 24px;
			}

			h3 {
				font-size: 18px;
			}

			h4 {
				font-size: 16px;
			}

			h5 {
				font-size: 14px;
			}

			h6 {
				color: #777777;
				font-size: 14px;
			}

			p, blockquote, ul, ol, dl, li, table, pre {
				margin: 15px 0;
			}

			hr {
				background-color: #e1e4e8;
				border: 0 none;
				color: #cccccc;
				height: .25em;
				padding: 0;
				margin: 24px 0;
			}

			body > h2:first-child {
				margin-top: 0;
				padding-top: 0;
			}

			body > h1:first-child {
				margin-top: 0;
				padding-top: 0;
			}

			body > h1:first-child + h2 {
				margin-top: 0;
				padding-top: 0;
			}

			dy > h3:first-child, body > h4:first-child, body > h5:first-child, body > h6:first-child {
				margin-top: 0;
				padding-top: 0;
			}

			a:first-child h1, a:first-child h2, a:first-child h3, a:first-child h4, a:first-child h5, a:first-child h6 {
				margin-top: 0;
				padding-top: 0;
			}

			h1 p, h2 p, h3 p, h4 p, h5 p, h6 p {
				margin-top: 0;
			}

			li p.first {
				display: inline-block;
			}

			ul, ol {
				padding-left: 30px;
			}

			ol#footnotes {
				padding-top: 15px;
				background: transparent url(data:image/png;base64,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) repeat-x 0 0;
			}

			ul :first-child, ol :first-child {
				margin-top: 0;
			}

			ul :last-child, ol :last-child {
				margin-bottom: 0;
			}

			dl {
			  padding: 0;
			}

			dl dt {
				font-size: 14px;
				font-weight: bold;
				font-style: italic;
				padding: 0;
				margin: 15px 0 5px;
			}

			dl dt:first-child {
				padding: 0;
			}

			dl dt > :first-child {
				margin-top: 0;
			}

			dl dt > :last-child {
				margin-bottom: 0;
			}

			dl dd {
				margin: 0 0 15px;
				padding: 0 15px;
			}

			dl dd > :first-child {
				margin-top: 0;
			}

			dl dd > :last-child {
				margin-bottom: 0;
			}

			blockquote {
				border-left: 4px solid #dfe2e5;
				padding: 0 15px;
				color: #6a737d;
			}

			blockquote > :first-child {
				margin-top: 0;
			}

			blockquote > :last-child {
				margin-bottom: 0;
			}

			table {
				padding: 0;
			}

			table tr {
				border-top: 1px solid #cccccc;
				background-color: white;
				margin: 0;
				padding: 0;
			}

			table tr:nth-child(2n) {
				background-color: #f8f8f8;
			}

			table tr th {
				font-weight: bold;
				border: 1px solid #cccccc;
				text-align: left;
				margin: 0;
				padding: 6px 13px;
			}

			table tr td {
				border: 1px solid #cccccc;
				text-align: left;
				margin: 0;
				padding: 6px 13px;
			}

			table tr th :first-child, table tr td :first-child {
				margin-top: 0;
			}

			table tr th :last-child, table tr td :last-child {
				margin-bottom: 0;
			}

			img {
				max-width: 100%;
			}

			span.frame {
				display: block;
				overflow: hidden;
			}

			span.frame > span {
				border: 1px solid #dddddd;
				display: block;
				float: left;
				overflow: hidden;
				margin: 13px 0 0;
				padding: 7px;
				width: auto;
			}

			span.frame span img {
				display: block;
				float: left;
			}

			span.frame span span {
				clear: both;
				color: #333333;
				display: block;
				padding: 5px 0 0;
			}

			span.align-center {
				display: block;
				overflow: hidden;
				clear: both;
			}

			span.align-center > span {
				display: block;
				overflow: hidden;
				margin: 13px auto 0;
				text-align: center;
			}

			span.align-center span img {
				margin: 0 auto;
				text-align: center;
			}

			span.align-right {
				display: block;
				overflow: hidden;
				clear: both;
			}

			span.align-right > span {
				display: block;
				overflow: hidden;
				margin: 13px 0 0;
				text-align: right;
			}

			span.align-right span img {
				margin: 0;
				text-align: right;
			}

			span.float-left {
				display: block;
				margin-right: 13px;
				overflow: hidden;
				float: left;
			}

			span.float-left span {
				margin: 13px 0 0;
			}

			span.float-right {
				display: block;
				margin-left: 13px;
				overflow: hidden;
				float: right;
			}

			span.float-right > span {
				display: block;
				overflow: hidden;
				margin: 13px auto 0;
				text-align: right;
			}

			code, pre, tt {
				font-family: SFMono-Regular,Consolas,Liberation Mono,Menlo,Courier,monospace;
				line-height: 1.45;
			}

			code, tt {
				font-size: 85%;
				margin: 0 2px;
				padding: .2em .4em;
				white-space: nowrap;
				background-color: rgba(27,31,35,.05);
				border-radius: 3px;
			}

			pre code {
				font-size: inherit;
				margin: 0;
				padding: 0;
				white-space: pre;
				border: none;
				background: transparent;
			}

			.highlight pre {
				background-color: #f6f8fa;
				font-size: 13px;
				line-height: 19px;
				overflow: auto;
				padding: 6px 10px;
				border-radius: 3px;
			}

			pre {
				background-color: #f6f8fa;
				font-size: 13px;
				line-height: 19px;
				overflow: auto;
				padding: 16px;
				border-radius: 3px;
			}

			pre code, pre tt {
				background-color: transparent;
				border: none;
			}

			.syntax-all {
			}

			.syntax-entity {
				color: #6f42c1;
			}

			.syntax-tag {
				color: #22863a;
			}

			.syntax-keyword {
				color: #d73a49;
			}

			.syntax-parameter {
				color: #24292e;
			}

			.syntax-string {
				color: #003878;
			}

			.syntax-constant {
				color: #005cc5;
			}

			.syntax-variable {
				color: #e36209;
			}

			.syntax-escape {
				font-weight: bold;
				color:       #22863a;
			}

			.syntax-comment {
				color: #6a737d;
			}

			.syntax-error {
				color: #b31d28;
			}

			/* Markup Highlighting */

			.syntax-heading {
				font-weight: bold;
				color:       #005cc5;
			}

			.syntax-italic {
				font-style: italic;
				color:      #24292e;
			}

			.syntax-bold {
				font-weight: bold;
				color:       #24292e;
			}

			.syntax-deleted {
				color:            #b31d28;
				background-color: #ffeef0;
			}

			.syntax-inserted {
				color:            #22863a;
				background-color: #f0fff4;
			}

			.syntax-changed {
				color:            #e36209;
				background-color: #ffebda;
			}

			.syntax-link {
				text-decoration: underline;
				color:           #032f62;
			}

			.syntax-list {
				color: #e36209;
			}

			@keyframes highfade {
				0% {
					background-color: none;
				}
				20% {
					background-color: yellow;
				}
				100% {
					background-color: none;
				}
			}

			@-webkit-keyframes highfade { 0% { background-color: none; } 20% { background-color: yellow; } 100% {
			background-color: none; } }

index.html

<link href="github.css" rel="stylesheet">