diff --git a/Bootstrap_new/css/theme-modern.css b/Bootstrap_new/css/theme-modern.css
index 69394609..c3de6040 100644
--- a/Bootstrap_new/css/theme-modern.css
+++ b/Bootstrap_new/css/theme-modern.css
@@ -388,6 +388,16 @@ h1, h2, h3, h4, h5, h6, .fw-bold, .fw-semibold {
   width: 100% !important;
 }
 
+.sidebar-nav .nav-content li a.active-submenu::before {
+    content: '';
+    position: absolute;
+    left: -16px; /* S'aligne sur la bordure gauche du nav-content */
+    top: 20%;
+    height: 60%;
+    width: 3px;
+    background: #FFFFFF;
+    border-radius: 0 2px 2px 0;
+}
 
 .sidebar-nav .nav-content li a.active-submenu::after {
   content: '';