diff --git a/invenio_theme_tugraz/assets/semantic-ui/less/invenio_theme_tugraz/header.less b/invenio_theme_tugraz/assets/semantic-ui/less/invenio_theme_tugraz/header.less
index 5fe90f9..52a7cee 100644
--- a/invenio_theme_tugraz/assets/semantic-ui/less/invenio_theme_tugraz/header.less
+++ b/invenio_theme_tugraz/assets/semantic-ui/less/invenio_theme_tugraz/header.less
@@ -206,7 +206,7 @@ svg:not(:root) {
 }
 
 .main-menu-underline-line {
-  border: 2px solid #e4154b !important;
+  border: 3px solid #e4154b !important;
 }
 
 .affiliation-text a:hover {