diff --git a/Bootstrap_new/css/theme-modern.css b/Bootstrap_new/css/theme-modern.css
index 7c7fc0b4..211499a2 100644
--- a/Bootstrap_new/css/theme-modern.css
+++ b/Bootstrap_new/css/theme-modern.css
@@ -272,7 +272,7 @@ h1, h2, h3, h4, h5, h6, .fw-bold, .fw-semibold {
     left: 0;
     height: calc(100vh - var(--header-height));
     overflow-y: auto;
-    border-right: 1px solid #fff;
+    border-right: 3px solid #fff;
     transition: width var(--transition-base);
     z-index: 900;
     padding: 0.5rem 0.5rem;