diff -r 945c9816ec1d -r db63872e10cc mercurial/configitems.py
--- a/mercurial/configitems.py	Fri Jun 30 03:45:51 2017 +0200
+++ b/mercurial/configitems.py	Fri Jun 30 03:45:52 2017 +0200
@@ -640,6 +640,9 @@
 coreconfigitem('web', 'stripes',
     default=1,
 )
+coreconfigitem('web', 'style',
+    default='paper',
+)
 coreconfigitem('worker', 'backgroundclose',
     default=dynamicdefault,
 )