fixed https://github.com/b3log/solo/issues/12596

nijigen/css/_icon.scss

@@ -16,6 +16,12 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
+/*
+ * icon font
+ *
+ * @author <a href="http://vanessa.b3log.org">Liyuan Li</a>
+ * @version 0.2.0.0, Dec 17, 2018
+*/
 @font-face {
   font-family: 'icomoon';
   src: url('fonts/icomoon.eot?oyqnlj');
@@ -108,4 +114,8 @@
 
 .icon__rss:before {
   content: "\e901";
+}
+
+.icon__more:before {
+  content: "\e902";
 }