add css class for horizontal lists

data/static/css/theme-peachy.css

@@ -64,13 +64,6 @@ a:visited {
   justify-content: space-between;
   align-items: baseline;
 }
-#topnav ul {
-  display: inline;
-  margin-left: 0;
-}
-#topnav ul li {
-  display: inline list-item;
-}
 
 #bottomnav {
   padding: 6px;
@@ -1163,6 +1156,14 @@ ul, ol {
   padding: 0;
 }
 
+ul.horizontal, ol.horizontal {
+  display: inline;
+  margin-left: 0;
+}
+ul.horizontal li, ol.horizontal li {
+  display: inline list-item;
+}
+
 .new-concept-notification.hidden {
   display: none;
 }