@media replaced by bootsrap-mixin

scss/_navbar.scss

@@ -280,7 +280,7 @@
   .navbar-brand {
     color: $navbar-light-brand-color;
 
-    @media (max-width: 992px) {
+    @include media-breakpoint-down(lg) {
       flex: 1;
       font-size: calc(1.375rem + 1.5vw);
       white-space: nowrap;