refactor: update flex selector in DLayout.style.scss for improved specificity

Author: nicosammito

src/components/d-layout/DLayout.style.scss

@@ -8,7 +8,7 @@
   height: 100%;
   overflow: hidden;
 
-  .flex {
+  > .flex, > .flex > .flex {
     width: 100%;
     height: 100%;
     gap: variables.$xs;