app/views/admin_mailer/invite.html.erb
<h1>
Welcome!
</h1>
<p>
<%= @invite.user.name %> has invited you to Pages on
<%= PagesCore.config(:site_name) %>.<br>
Click the button below to create your account and get started.
</p>
<div class="buttons">
<%= link_to("Create account", @url, class: "primary button") %>
</div>