diff --git a/themes/tiddlywiki/vanilla/base.tid b/themes/tiddlywiki/vanilla/base.tid
index 1ca85c6a7..5b19dd61f 100644
--- a/themes/tiddlywiki/vanilla/base.tid
+++ b/themes/tiddlywiki/vanilla/base.tid
@@ -1335,6 +1335,7 @@ canvas.tc-edit-bitmapeditor  {
 	clear: both;
 }
 
+.tc-single-tiddler-window .tc-tiddler-body,
 .tc-tiddler-frame .tc-tiddler-body {
 	font-size: {{$:/themes/tiddlywiki/vanilla/metrics/bodyfontsize}};
 	line-height: {{$:/themes/tiddlywiki/vanilla/metrics/bodylineheight}};
@@ -1344,6 +1345,11 @@ canvas.tc-edit-bitmapeditor  {
 	overflow: hidden; /* https://github.com/Jermolene/TiddlyWiki5/issues/282 */
 }
 
+/*
+* Tiddler in a new window.
+* Also see: .tc-single-tiddler-window .tc-tiddler-body, above
+*/
+
 html body.tc-body.tc-single-tiddler-window {
 	margin: 1em;
 	background: <<colour tiddler-background>>;