diff --git a/SwichGIT/Doc/Etudes formes/style.css b/SwichGIT/Doc/Etudes formes/style.css
index b764f61..ecf27c1 100644
--- a/SwichGIT/Doc/Etudes formes/style.css	
+++ b/SwichGIT/Doc/Etudes formes/style.css	
@@ -27,6 +27,7 @@
     width: var(--x);
     display: table-cell;
     vertical-align: middle;
+    background-color: grey;
 }
 
 .anneau {