app/views/devise/mailer/unlock_instructions.html.erb
<td style="<%= css_for_mailer_content %>">
<h1 style="<%= css_for_mailer_heading %>">
<%= t("devise_views.mailer.unlock_instructions.title") %>
</h1>
<p style="<%= css_for_mailer_text %>">
<%= t("devise_views.mailer.unlock_instructions.hello") %> <strong><%= @resource.email %></strong>
</p>
<p style="<%= css_for_mailer_text %>">
<%= t("devise_views.mailer.unlock_instructions.info_text") %>
</p>
<p style="<%= css_for_mailer_text %>">
<%= t("devise_views.mailer.unlock_instructions.instructions_text") %>
</p>
<p style="<%= css_for_mailer_text %>">
<%= link_to t("devise_views.mailer.unlock_instructions.unlock_link"),
unlock_url(@resource, unlock_token: @token),
style: css_for_mailer_link %>
</p>
</td>