diff --git a/static/css/cours.css b/static/css/cours.css
index 8110335..91d6cb1 100644
--- a/static/css/cours.css
+++ b/static/css/cours.css
@@ -45,3 +45,7 @@ aside li.directory {
     visibility: hidden;
   }
 }
+
+main img {
+  max-width: 100%;
+}