Maybe/app/views/registrations/new.html.erb

<%
  header_title "Create an account"
%>

<%= form_with model: @user, url: registration_path, html: {class: 'space-y-6'} do |form| %>
  <% if form.object.errors.any? %>
    <% form.object.errors.full_messages.each do |message| %>
      <div><%= message %></div>
    <% end %>
  <% end %>

  <div class="relative border border-gray-100 bg-offwhite rounded-xl focus-within:bg-white focus-within:shadow focus-within:opacity-100">
    <%= form.label :email, class: 'p-4 pb-0 block text-sm font-medium text-gray-700' %>
    <%= form.email_field :email, autofocus: false, autocomplete: "email", required: 'required', placeholder: 'you@example.com', class: 'p-4 pt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100 w-full' %>
  </div>

  <div class="relative border border-gray-100 bg-offwhite rounded-xl focus-within:bg-white focus-within:shadow focus-within:opacity-100">
    <%= form.label :password, "Password", class: 'p-4 pb-0 block text-sm font-medium text-gray-700' %>
    <%= form.password_field :password, autocomplete: "new-password", required: 'required', class: 'p-4 pt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100 w-full' %>
  </div>

  <div class="relative border border-gray-100 bg-offwhite rounded-xl focus-within:bg-white focus-within:shadow focus-within:opacity-100">
    <%= form.label :password_confirmation, "Password confirmation", class: 'p-4 pb-0 block text-sm font-medium text-gray-700' %>
    <%= form.password_field :password_confirmation, autocomplete: "new-password", required: 'required', class: 'p-4 pt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100 w-full' %>
  </div>

  <% if hosted_app? %>
    <div class="bg-offwhite rounded-xl focus-within:bg-white focus-within:shadow focus-within:opacity-100 relative border border-gray-100">
      <%= form.label :invite_code, "Invite code", class: 'p-4 pb-0 block text-sm font-medium text-gray-700' %>
      <%= form.password_field :invite_code, required: 'required', class: 'p-4 pt-1 bg-transparent border-none opacity-50 focus:outline-none focus:ring-0 focus-within:opacity-100 w-full' %>
    </div>
  <% end %>

  <div>
    <%= form.submit "Continue", class: 'flex justify-center w-full px-4 py-3 text-sm font-medium text-white bg-black rounded-xl hover:bg-black focus:outline-none focus:ring-2 focus:ring-gray-200 shadow' %>
  </div>
<% end %>