right menue SiteTitle and SiteSubtitle decoupled from tiddler title and tiddler subtitle. Otherwise it is not possible to modify the tiddler title styling, without affecting the site title.

core/ui/PageTemplate/sidebar.tid

@@ -7,8 +7,8 @@ tags: $:/tags/PageTemplate
 
 <$reveal state="$:/state/sidebar" type="match" text="yes" default="yes" retain="yes">
 
-<div class="titlebar">{{$:/SiteTitle}}</div>
+<div class="tw-site-title">{{$:/SiteTitle}}</div>
-<div class="tw-subtitle">{{$:/SiteSubtitle}}</div>
+<div class="tw-site-subtitle">{{$:/SiteSubtitle}}</div>
 
 <div class="tw-page-controls">
 

themes/tiddlywiki/vanilla/base.tid

@@ -527,6 +527,7 @@ a.tw-tiddlylink-external:hover {
 	}
 }
 
+.tw-site-title,
 .titlebar {
 	font-weight: 300;
 	font-size: 2.35em;