diff --git a/www/style_Rmd.css b/www/style_Rmd.css
index aa106702be85ab894c5186635068c5c5586ee65b..48541eb291c94a2211b7a4df61945a7b515289bd 100644
--- a/www/style_Rmd.css
+++ b/www/style_Rmd.css
@@ -16,7 +16,7 @@ body {
 }
 
 .red_pencadre {
-  border: 4px;
+  border: 6px;
   border-style: solid;
   border-color: #d53600;
   background-color: #f9e9e7;