redo sidenav

scss/_navbar.scss

@@ -58,6 +58,18 @@
   bottom: 0;
 }
 
+.navbar-sticky-top {
+  position: sticky;
+  top: 0;
+  width: 100%;
+  z-index: $zindex-navbar-sticky;
+
+  // Undo the rounded corners
+  @include media-breakpoint-up(sm) {
+    @include border-radius(0);
+  }
+}
+
 
 // Brand/project name
 

scss/_variables.scss

@@ -225,6 +225,7 @@ $zindex-dropdown:          1000 !default;
 $zindex-popover:           1060 !default;
 $zindex-tooltip:           1070 !default;
 $zindex-navbar-fixed:      1030 !default;
+$zindex-navbar-sticky:     1030 !default;
 $zindex-modal-bg:          1040 !default;
 $zindex-modal:             1050 !default;