Add .section-link styling.

Author: tabatkins

default.css

@@ -90,6 +90,28 @@ ul.indexlist li { margin-left: 0; list-style: none }
 ul.indexlist li li { margin-left: 1em }
 ul.indexlist a { font-weight: bold; }
 
+/* The self-link that headings may have. */
+a.section-link {
+	background: #ddd;
+	border: none;
+	color: #444;
+	display: none;
+	font-size: 16px;
+	height: 1.4em;
+	margin: 0 .5em;
+	text-align: center;
+	vertical-align: text-bottom;
+	width: 1.4em;
+}
+h2:hover a.section-link,
+h3:hover a.section-link,
+h4:hover a.section-link,
+h5:hover a.section-link,
+h6:hover a.section-link {
+	display: inline-block;
+}
+
+
 /* Examples */
 
 .example {