ISTWCMS-3574: updating scss to use new contained width mixin

source/_patterns/04-components/call-to-action/_call-to-action.scss

@@ -46,9 +46,7 @@ $faculties: 'org-default', 'org-ahs', 'org-art', 'org-eng', 'org-env', 'org-mat'
   width: 100%;
 
   &.uw-contained-width {
-    margin-left: auto;
-    margin-right: auto;
-    max-width: 63rem;
+    @include uw-contained-width;
     padding: 0 1rem;
   }