diff --git a/themes/tiddlywiki/centralised/styles.tid b/themes/tiddlywiki/centralised/styles.tid
index 410a97c23..308273591 100644
--- a/themes/tiddlywiki/centralised/styles.tid
+++ b/themes/tiddlywiki/centralised/styles.tid
@@ -17,6 +17,13 @@ tags: [[$:/tags/Stylesheet]]
 		text-align: left;
 	}
 
+	html[dir="rtl"] .tc-story-river {
+		text-align: right;
+		margin: 0 auto;
+		padding-right: {{$:/themes/tiddlywiki/centralised/metrics/storypaddingright}};
+		padding-left: {{$:/themes/tiddlywiki/centralised/metrics/storypaddingleft}};
+	}
+
 	html .tc-sidebar-scrollable {
 		text-align: left;
 		left: 50%;
@@ -25,6 +32,16 @@ tags: [[$:/tags/Stylesheet]]
 		width: auto;
 	}
 
+	html[dir="rtl"] .tc-sidebar-scrollable {
+		text-align: right;
+		margin-left: 0;
+		right: 50%;
+		left: 0;
+		margin-right: min(calc((100% - (2 * {{$:/themes/tiddlywiki/centralised/metrics/sidebarminwidth}})) / 2 - 42px),calc({{$:/themes/tiddlywiki/centralised/metrics/storywidth}} / 2 - 42px));
+		padding-right: 42px;
+		padding-left: 0;
+	}
+
 	html .tc-tiddler-frame {
 		width: 100%;
 	}
@@ -32,4 +49,9 @@ tags: [[$:/tags/Stylesheet]]
 	html .tc-sidebar-resizer {
 		left: min(calc(50% + ({{$:/themes/tiddlywiki/centralised/metrics/storywidth}} / 2) - (2 * {{$:/themes/tiddlywiki/centralised/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/centralised/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/centralised/metrics/storypaddingright}} / 3)));
 	}
+
+	html[dir="rtl"] .tc-sidebar-resizer {
+		left: auto;
+		right: min(calc(50% + ({{$:/themes/tiddlywiki/centralised/metrics/storywidth}} / 2) - (2 * {{$:/themes/tiddlywiki/centralised/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/centralised/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/centralised/metrics/storypaddingright}} / 3)));
+	}
 }
diff --git a/themes/tiddlywiki/tight/base.tid b/themes/tiddlywiki/tight/base.tid
index c17dea392..43a950291 100644
--- a/themes/tiddlywiki/tight/base.tid
+++ b/themes/tiddlywiki/tight/base.tid
@@ -44,6 +44,11 @@ tags: [[$:/tags/Stylesheet]]
 			left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + 42px),calc({{$:/themes/tiddlywiki/tight/metrics/storyright}} + 42px),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + 42px));
 		}
 
+		html[dir="rtl"] body.tc-body div.tc-sidebar-scrollable {
+			left: 0;
+			right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + 42px),calc({{$:/themes/tiddlywiki/tight/metrics/storyright}} + 42px),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + 42px));
+		}
+
 	<% endif %>
 
 	html body.tc-body .tc-tiddler-frame .tc-subtitle {
@@ -108,12 +113,22 @@ tags: [[$:/tags/Stylesheet]]
 		left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),clamp(calc({{$:/themes/tiddlywiki/tight/metrics/storywidth}}),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/tight/metrics/storywidth}}),calc({{$:/themes/tiddlywiki/tight/metrics/storyright}})),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/tight/metrics/storywidth}} - {{$:/themes/tiddlywiki/tight/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}));
 	}
 
+	html[dir="rtl"] .tc-sidebar-resizer {
+		left: auto;
+		right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),clamp(calc({{$:/themes/tiddlywiki/tight/metrics/storywidth}}),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/tight/metrics/storywidth}}),calc({{$:/themes/tiddlywiki/tight/metrics/storyright}})),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/tight/metrics/storywidth}} - {{$:/themes/tiddlywiki/tight/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}));
+	}
+
 	<%if [{$:/themes/tiddlywiki/vanilla/options/sidebarlayout}match[fluid-fixed]] %>
 
 		html .tc-sidebar-resizer {
 			left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),calc(100% - {{$:/themes/tiddlywiki/tight/metrics/sidebarwidth}}),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}));
 		}
 
+		html[dir="rtl"] .tc-sidebar-resizer {
+			left: auto;
+			right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),calc(100% - {{$:/themes/tiddlywiki/tight/metrics/sidebarwidth}}),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}));
+		}
+
 	<% endif %>
 
 }
diff --git a/themes/tiddlywiki/vanilla/sidebar-resizer.tid b/themes/tiddlywiki/vanilla/sidebar-resizer.tid
index d87aa8116..47eb59fef 100644
--- a/themes/tiddlywiki/vanilla/sidebar-resizer.tid
+++ b/themes/tiddlywiki/vanilla/sidebar-resizer.tid
@@ -82,26 +82,30 @@ code-body: yes
 
 	<% endif %>
 
-	.tc-sidebar-resizer {
-		left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc({{$:/themes/tiddlywiki/vanilla/metrics/storyright}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3))),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3) + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - {{$:/themes/tiddlywiki/vanilla/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
-	}
-
-	html[dir="rtl"] .tc-sidebar-resizer {
-		left: auto;
-		right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc({{$:/themes/tiddlywiki/vanilla/metrics/storyright}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3))),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3) + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - {{$:/themes/tiddlywiki/vanilla/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
-	}
-
-	<%if [{$:/themes/tiddlywiki/vanilla/options/sidebarlayout}match[fluid-fixed]] %>
+	<%if [{$:/theme}!match[$:/themes/tiddlywiki/centralised]] %>
 
 		.tc-sidebar-resizer {
-			left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
+			left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc({{$:/themes/tiddlywiki/vanilla/metrics/storyright}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3))),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3) + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - {{$:/themes/tiddlywiki/vanilla/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
 		}
 
 		html[dir="rtl"] .tc-sidebar-resizer {
 			left: auto;
-			right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
+			right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),max(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc({{$:/themes/tiddlywiki/vanilla/metrics/storyright}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3))),max(calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3) + ({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storywidth}} - {{$:/themes/tiddlywiki/vanilla/metrics/storyright}})),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)))),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - (2 * {{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
 		}
 
+		<%if [{$:/themes/tiddlywiki/vanilla/options/sidebarlayout}match[fluid-fixed]] %>
+
+			.tc-sidebar-resizer {
+				left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
+			}
+
+			html[dir="rtl"] .tc-sidebar-resizer {
+				left: auto;
+				right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + ({{$:/themes/tiddlywiki/vanilla/metrics/storypaddingright}} / 3)));
+			}
+
+		<% endif %>
+
 	<% endif %>
 
 	<%if [{$:/state/sidebar}match[no]] %>