markdown editor prettify add linenums

public/css/theme/includes/header.less

@@ -271,3 +271,24 @@ a:hover {
   vertical-align: middle;
   visibility: hidden;
 }
+
+#inviteFriends {
+  position: relative;
+  .dot {
+    display: inline-block;
+    position: absolute;
+    right: -8px;
+    top: -8px;
+    width: 8px;
+    height: 8px;
+    border-radius: 50%;
+    background: #FF9263;
+  }
+}
+
+#inviteUrl {
+  width: 400px;
+  padding: 3px;
+  border-radius: 3px;
+  border: 1px solid #eee;
+}