Fix gap navbar and content

src/client/styles/scss/_layout_kibela.scss

@@ -56,6 +56,9 @@ body.kibela {
     min-height: 8em;
     margin: auto;
     border-radius: 0.35em;
+    @include media-breakpoint-down(xs) {
+      top: 0px;
+    }
   }
 
   .grw-subnav {
@@ -73,6 +76,10 @@ body.kibela {
     @media screen and (max-width: 765px) {
       padding-top: 30px;
     }
+
+    @include media-breakpoint-down(xs) {
+      padding-top: 0px;
+    }
   }
 
   .revision-toc {