diff --git a/data/indexstyle.css b/data/indexstyle.css
index 8dec963..30a780f 100644
--- a/data/indexstyle.css
+++ b/data/indexstyle.css
@@ -25,7 +25,7 @@ a { text-decoration:none}
 hr { margin: 0; border-collapse:collapse;  }
 
 table#tree { margin: 0; padding: 1ex 1ex; }
-table#tree { width:640px; text-align:left;  margin: auto}
+table#tree { width:100%; text-align:left;  margin: auto}
 
 
 table#tree table { padding:0; padding-left: 4ex; width:100%; margin:0; border:0; }