chore: 🤖 Refactor main element padding (#2030)

* chore: 🤖 Refactor main element padding

Refactor main element padding to achieve consistency within all our
UI's. This is a quick solution until we adopt app-frame and follow the
same layouting pattern within all our UI's

✅ Closes: ICU-11960

* Delete unnecessasry @use size

addons/rose/app/styles/rose/components/layout/_index.scss

@@ -3,8 +3,6 @@
  * SPDX-License-Identifier: MPL-2.0
  */
 
-@use '../../variables/sizing';
-
 @import 'global';
 @import 'sidebar';
 @import 'page';
@@ -15,5 +13,5 @@
 // but used here reflects the fact that the "main" element, of which there
 // can only be one per page, generally has padding in Structure layouts.
 main {
-  padding: sizing.rems(l);
+  padding: 1.5rem 3rem;
 }