app/views/layouts/devise.html.erb
<%= inside_layout 'application' do %>
<div class="container">
<div class="row">
<div class="col-md-3">
<div class="panel panel-default">
<div class="panel-body">
<ul class="nav nav-pills nav-stacked">
<li><%= link_to t('profile.title'), edit_user_registration_url %></li>
<li><%= link_to t('profile.auth_token'), users_token_index_url %></li>
<li><%= link_to t('profile.cancel_account'), user_registration_url, data: { confirm: "Are you sure?\n\nThis will delete all data connected to your account." }, method: :delete %></li>
</ul>
</div>
</div>
</div>
<div class="col-md-9">
<div class="panel panel-default">
<%= yield %>
</div>
</div>
</div>
</div>
<% end %>