diff --git a/tw5.com/shadows/styles.css b/tw5.com/shadows/styles.css
index 5349dcee6..655be2d92 100644
--- a/tw5.com/shadows/styles.css
+++ b/tw5.com/shadows/styles.css
@@ -83,6 +83,9 @@ a.tw-tiddlylink-missing {
 	-webkit-box-shadow: inset 1px 1px 1px 1px rgba(0, 0, 0, 0.2);
 	-moz-box-shadow: inset 1px 1px 1px 1px rgba(0, 0, 0, 0.2);
 	box-shadow: inset 1px 1px 1px 1px rgba(0, 0, 0, 0.2);
+    -moz-tab-size: 4;
+    -o-tab-size: 4;
+    tab-size: 4;
 }
 
 .javascript-source .javascript-boolean {