diff --git a/factures/commun/style.css b/factures/commun/style.css
index 1b538df..04234d4 100644
--- a/factures/commun/style.css
+++ b/factures/commun/style.css
@@ -26,7 +26,7 @@ body::after {
 
 sup {
   font-size: 0.7em;
-  vertical-align: 0.6;
+  vertical-align: 60%;
 }
 
 address {