diff --git a/optim-html.sh b/optim-html.sh
index 4e2b85f..d032bf5 100755
--- a/optim-html.sh
+++ b/optim-html.sh
@@ -24,7 +24,7 @@ for fic in $filelist; do
     fi
     print -n -- "$fic "
     cp $fic $tmp
-    perl -pi -e 's#<div id="outline-container-[^>]*>#<div>#g;s# id="org[a-f0-9]{7}"##g' $tmp
+    perl -pi -e 's#<div id="outline-container-[^"]*"([^>]*)>#<div$1>#g;s# id="org[a-f0-9]{7}"##g' $tmp
     minify --mime text/html $tmp > $fic
     print "[OK]"
 done