Issue #1799700 by attiks: Fixed Missing space in breakpoint.

core/themes/bartik/config/bartik.breakpoints.yml

 mobile: '(min-width: 0px)'
-narrow: 'all and (min-width: 560px) and (max-width:850px)'
+narrow: 'all and (min-width: 560px) and (max-width: 850px)'
 wide: 'all and (min-width: 851px)'

core/themes/bartik/css/layout.css

@@ -71,7 +71,7 @@ body,
   padding: 0 10px;
 }
 
-@media all and (min-width: 560px) and (max-width:850px) {
+@media all and (min-width: 560px) and (max-width: 850px) {
 
   #sidebar-first,
   .region-triptych-first,