:wrench: Add a class to encapsulate body

Allow to stylise raw components inside of the body only.

src/templates/main.html

@@ -117,7 +117,9 @@ $if(toc)$
             $^$$table-of-contents$
             </nav>
 $endif$
+            <div class="generated-body">
             $^$$body$
+            </div>
 $if(list)$
             <div class="card-columns">
                     $^$${ list:card() }