Fix mobile spacing issues with links

lib/music_library_web/components/core_components.ex

@@ -561,7 +561,7 @@ defmodule MusicLibraryWeb.CoreComponents do
 
   def back(assigns) do
     ~H"""
-    <div class="mt-4 md:mt-16 mb-4">
+    <div class="mt-4 md:mt-16">
       <.link
         navigate={@navigate}
         class="text-sm font-semibold leading-6 text-zinc-900 hover:text-zinc-700"

lib/music_library_web/components/layouts/app.html.heex

@@ -15,7 +15,7 @@
     </div>
   </div>
 </nav>
-<main class="px-4 py-20 max-sm:py-4 sm:px-6 lg:px-8">
+<main class="px-4 py-8 max-sm:pb-20 sm:px-6 lg:px-8">
   <div class="mx-auto max-w-5xl">
     <.flash_group flash={@flash} />
     <%= @inner_content %>