diff --git a/themes/tiddlywiki/vanilla/base.tid b/themes/tiddlywiki/vanilla/base.tid
index 500a8f16a..845436e0e 100644
--- a/themes/tiddlywiki/vanilla/base.tid
+++ b/themes/tiddlywiki/vanilla/base.tid
@@ -1031,7 +1031,7 @@ button.tc-btn-invisible.tc-remove-tag-button {
 
 	.tc-sidebar-left .tc-sidebar-scrollable {
 		left: 0;
-		right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),calc(<<get.theme.metric storyright>> + <<get.theme.metric storypaddingleft>>),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} + <<get.theme.metric storypaddingleft>>));
+		right: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}}),calc(<<get.theme.metric storyright>>),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}}));
 		margin: 0 0 0 0;
 	}
 
@@ -1053,8 +1053,8 @@ button.tc-btn-invisible.tc-remove-tag-button {
 	}
 
 	.tc-sidebar-left .tc-story-river {
-		left: clamp({{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}},calc(100% - <<get.theme.metric storywidth>> - {{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + <<get.theme.metric storypaddingleft>>),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} + <<get.theme.metric storypaddingleft>>));
-		right: max(0px,{{$:/themes/tiddlywiki/vanilla/metrics/storyleft}});
+		left: clamp(calc({{$:/themes/tiddlywiki/vanilla/metrics/sidebarminwidth}} - <<get.theme.metric storypaddingleft>>),calc(100% - <<get.theme.metric storywidth>> - {{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} - <<get.theme.metric storypaddingleft>>),calc(100% - {{$:/themes/tiddlywiki/vanilla/metrics/storyminwidth}} - <<get.theme.metric storypaddingleft>>));
+		right: max(0px,{{$:/themes/tiddlywiki/vanilla/metrics/storyleft}} + <<get.theme.metric storypaddingleft>>);
 	}
 
 	html[dir="rtl"] .tc-story-river:not(.tc-sidebar-left .tc-story-river) {
@@ -1533,7 +1533,7 @@ html body.tc-body.tc-single-tiddler-window {
 		right: 0;
 	}
 
-	.tc-tiddler-frame {
+	.tc-tiddler-frame, .tc-sidebar-left .tc-tiddler-frame {
 		width: 100%;
 	}