app/views/spree/admin/suppliers/_form.html.erb
<div data-hook="supplier_address_wrapper" class="col-md-6">
<fieldset class="no-border-bottom">
<legend align="center"><%= Spree.t('contact_address') %></legend>
<%= form.fields_for :address do |contact_form| %>
<%= render :partial => 'spree/admin/shared/address_form', :locals => { :f => contact_form, :name => Spree.t(:contact_address), :type => "shipping" } %>
<% end %>
</fieldset>
</div>
<%# added bootstrap classes for 'field_container' and '' %>
<div data-hook="supplier_details_wrapper" class="col-md-6">
<fieldset class="no-border-bottom">
<legend align="center" ><%= Spree.t('supplier_details') %></legend>
<%= form.field_container :name, class: ['form-group'] do %>
<%= form.label :name, Spree::Supplier.human_attribute_name(:name) %>:<br />
<%= form.text_field :name, :class => 'form-control' %>
<% end %>
<%= form.field_container :email, class: ['form-group'] do %>
<%= form.label :email, Spree::Supplier.human_attribute_name(:email) %>:<br />
<%= form.email_field :email, :class => 'form-control' %>
<%# email validation %>
<%= error_message_on :user, :email %>
<% end %>
<%= form.field_container :url, class: ['form-group'] do %>
<%= form.label :url, Spree::Supplier.human_attribute_name(:url) %>:<br />
<%= form.text_field :url, :class => 'form-control' %>
<% end %>
<%= form.field_container :tax_id, class: ['form-group'] do %>
<%= form.label :tax_id, Spree::Supplier.human_attribute_name(:tax_id) %>:<br />
<%= form.text_field :tax_id, :class => 'form-control' %>
<% end %>
<% if spree_current_user.admin? %>
<%= form.field_container :commission_flat_rate, class: ['form-group'] do %>
<%= form.label :commission_flat_rate, Spree::Supplier.human_attribute_name(:commission_flat_rate) %>:<br />
<%= form.text_field :commission_flat_rate, :class => 'form-control' %>
<% end %>
<%= form.field_container :commission_percentage , class: ['form-group'] do %>
<%= form.label :commission_percentage, Spree::Supplier.human_attribute_name(:commission_percentage) %>:<br />
<%= form.text_field :commission_percentage, :class => 'form-control' %>
<% end %>
<%= form.field_container :users, class: ['form-group'] do %>
<%= form.label :users %><br/>
<%= hidden_field_tag 'supplier[user_ids_string]', form.object.user_ids.join(','), class: 'user_picker' %>
<% end %>
<%= form.field_container :active, class: ['form-group'] do %>
<div class="checkbox">
<%= label_tag :active do %>
<%= form.check_box :active %>
<%= Spree::Supplier.human_attribute_name(:active) %>
<% end %>
</div>
<% end %>
<% end %>
<%# This moved to _edit(new)_resource_links.html.erb %>
<!--<div class='center'>-->
<%# if form.object.new_record? %>
<%#= button Spree.t('create') %>
<%# else %>
<%#= button Spree.t('update') %>
<%# end %>
<%#= Spree.t('or') %>
<%# if can? :index, Spree::Supplier %>
<%#= link_to Spree.t('cancel'), collection_url %>
<%# else %>
<%#= link_to Spree.t('cancel'), spree.account_path %>
<%# end %>
<!--</div>-->
</fieldset>
</div>