Simplify and clean up styles

app/views/assignments/_filteredlist.html.erb

-<div class="relative inline-block w-64" data-controller="filteredlist">
-  <div class="relative">
+<div data-controller="filteredlist">
   <input
     type="text"
     data-filteredlist-target="input"
     data-action="input->filteredlist#filter"
     autocomplete="off"
-      class="w-full border border-gray-300 rounded-md shadow-sm pl-3 pr-10 py-2 text-sm focus:ring-indigo-500 focus:border-indigo-500"
+    class="w-full border border-gray-300 rounded-md shadow-sm text-sm p-1 focus:ring-indigo-500 focus:border-indigo-500"
     placeholder="Filter..."
   />
   <ul data-filteredlist-target="list" class="flex flex-row flex-wrap gap-1 my-1 flex-shrink-0">
@@ -14,4 +13,3 @@
     <% end %>
   </ul>
 </div>
-</div>