public static function sitemap_xsl_css() {
    return <<<CSS
		body {
			font: 14px 'Open Sans', Helvetica, Arial, sans-serif;
			margin: 0;
		}

		a {
			color: #3498db;
			text-decoration: none;
		}

		h1 {
			margin: 0;
		}

		#description {
			background-color: #81a844;
			color: #FFF;
			padding: 30px 30px 20px;
		}

		#description a {
			color: #fff;
		}

		#content {
			padding: 10px 30px 30px;
			background: #fff;
		}

		a:hover {
			border-bottom: 1px solid;
		}

		th, td {
			font-size: 12px;
		}

		th {
			text-align: left;
			border-bottom: 1px solid #ccc;
		}

		th, td {
			padding: 10px 15px;
		}

		.odd {
			background-color: #E7F1D4;
		}

		#footer {
			margin: 20px 30px;
			font-size: 12px;
			color: #999;
		}

		#footer a {
			color: inherit;
		}

		#description a, #footer a {
			border-bottom: 1px solid;
		}

		#description a:hover, #footer a:hover {
			border-bottom: none;
		}

		img.thumbnail {
			max-height: 100px;
			max-width: 100px;
		}
CSS;
  }