Simplify and clean up styles

app/views/assignments/_filteredlist.html.erb

-<div class="relative inline-block w-64" data-controller="filteredlist">
-  <div class="relative">
-    <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"
-      placeholder="Filter..."
-    />
-    <ul data-filteredlist-target="list" class="flex flex-row flex-wrap gap-1 my-1 flex-shrink-0">
-      <% users.each do |user| %>
-        <%= render partial: 'assignments/filteredlist_option', locals: { session: session, user: user } %>
-      <% end %>
-    </ul>
-  </div>
+<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 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">
+    <% users.each do |user| %>
+      <%= render partial: 'assignments/filteredlist_option', locals: { session: session, user: user } %>
+    <% end %>
+  </ul>
 </div>