refs #22929 [finc] adds variable for bottom border of fixed headers

themes/finc/scss/_customVariables.scss

@@ -663,6 +663,9 @@ $navbar-bg-color-xs: $navbar-default-toggle-hover-bg !default;
 $navbar-xs-openend-margin-bottom: 1rem !default;
 $navbar-fixed-bg-color: $header-bg-color !default;
 
+// Bootstrap theme gives '.navbar-fixed-top' and '.navbar-fixed-bottom' a top or bottom border of 1px:
+// set this variable in your theme according to your preferences
+$navbar-fixed-top-border-bottom-width: 0 !default;
 
 // Header, navbar and breadcrumbs default margin for centered design - change here for full width
 $header-navbar-breadcrumbs-margin: 0 auto !default;

themes/finc/scss/components/_header-navbar.scss

@@ -54,6 +54,9 @@ header,
 // Keep navbar on left, when off-canvas is active, and give it the same appearance as ever
 // the '.active' class is set on body when the user hits the button to display the sidebar
 .navbar-fixed-top {
+  border-bottom: $navbar-fixed-top-border-bottom-width;
+
+
   .offcanvas.active & {
     margin-top: -$navbar-height-xs;
     position: relative;