app/views/devise/sessions/new.html.erb
<div class="container">
<div class="row">
<div class="col-sm-6 col-sm-offset-3 col-xs-8 col-xs-offset-2 form-frame">
<h2>Sign in</h2>
<%= form_for(resource, :as => resource_name, :url => session_path(resource_name)) do |f| %>
<% if session[:pending_organisation_id] %>
<input type="hidden" name="pending_organisation_id" value = "<%= session[:pending_organisation_id] %>">
<% end %>
<div class="form-group">
<%= f.label :email %>
<%= f.email_field :email, :class => 'form-control', :autofocus => true %>
</div>
<div class="form-group">
<%= f.label :password %>
<%= f.password_field :password, :class => 'form-control' %>
</div>
<% if devise_mapping.rememberable? -%>
<div class="form-group"><%= f.check_box :remember_me %> <%= f.label :remember_me, :style => "display: inline;" %></div>
<% end -%> <br>
<div class="form-group">
<%= f.submit 'Sign in', :class => 'btn btn-primary btn-block' %>
</div>
<% end %>
<%= render "devise/shared/links" %>
</div>
</div>
</div>