app/views/user_mailer/welcome.html.erb
<div class="section">
<div class="section-wrap">
<div class="section-title">
<%= t("mail.welcome.title") %>
</div>
<div class="section-content">
<p>
<%= t("mail.welcome.user_info") %><%= @user.name %>。
</p>
<p>
<%= t("mail.welcome.login_link") %><a href="<%= @url %>"><%= @url %></a>
</p>
<p>
<%= t("mail.welcome.enjoy_image") %>
</p>
</div>
</div>
</div>