app/views/mailer/user_invite.html.erb
<td style="<%= css_for_mailer_content %>">
<h1 style="<%= css_for_mailer_heading %>">
<%= t("mailers.user_invite.title", org: Setting["org_name"]) %>
</h1>
<p style="<%= css_for_mailer_text %>">
<%= t("mailers.user_invite.text", org: Setting["org_name"]) %>
</p>
<p style="text-align: center;">
<%= link_to t("mailers.user_invite.button"), new_user_registration_url, style: css_for_mailer_button %>
</p>
<p style="<%= css_for_mailer_text %>">
<%= t("mailers.user_invite.ignore") %>
</p>
<p style="<%= css_for_mailer_text %>">
<%= t("mailers.user_invite.thanks") %>
</p>
</td>