diff --git a/css/style.css b/css/style.css
index fcb230d87315c79900db710c62400f1f247be794..4510297b102038aef403dbcaedd5d8392f085664 100644
--- a/css/style.css
+++ b/css/style.css
@@ -401,11 +401,11 @@ input::-moz-focus-inner, button::-moz-focus-inner {
 
 
 
-.module a.collapsed:after {
+.module a.btn.collapsed:after {
   content: '+ Voir plus';
 }
 
-.module a:not(.collapsed):after {
+.module a.btn:not(.collapsed):after {
   content: '- Voir moins';
 }