diff --git a/Bootstrap_new/css/theme-modern.css b/Bootstrap_new/css/theme-modern.css
index abcadefd..e9d3c788 100644
--- a/Bootstrap_new/css/theme-modern.css
+++ b/Bootstrap_new/css/theme-modern.css
@@ -465,6 +465,12 @@ h1, h2, h3, h4, h5, h6, .fw-bold, .fw-semibold {
     background: var(--bg-base);
 }
 
+@media (max-width: 1199px) {
+  #main { margin-left: 0 !important; }
+  #sidebar { transform: translateX(-100%); }
+  #sidebar.sidebar-open { transform: translateX(0); }
+}
+
 /* --- NAVIGATION PAR ONGLETS (Ancien Scrollmenu) --- */
 .scrollmenu {
     display: flex;