pl-fe: add card background to widgets

Signed-off-by: nicole mikołajczyk <git@mkljczk.pl>

packages/pl-fe/src/styles/new/layout.scss

@@ -349,6 +349,8 @@ body {
 }
 
 .⁂-widget {
+  @include mixins.card($variant: rounded);
+  @apply black:p-0;
   display: flex;
   flex-direction: column;
   gap: 1rem;