app/views/devise/sessions/new.html.erb
<% provide(:title, t("sign.in.title")) %>
<h1><%= t("sign.in.title") %></h1>
<div class="row">
<div class="span6 offset3">
<%= form_for(resource, :as => resource_name, :url => session_path(resource_name)) do |f| %>
<%= f.label :email %>
<%= f.email_field :email %>
<%= f.label :password %>
<%= f.password_field :password %>
<% if devise_mapping.rememberable? -%>
<div><%= f.check_box :remember_me %> <%= f.label :remember_me %></div>
<% end -%>
<%= f.submit t("sign.in.link"), class: "btn btn-large btn-primary" %>
<% end %>
</div>
</div>
<%= render :partial => "devise/shared/links" %>