anchor.diff: -<div class="container">
  +<div class="container-fluid">
     <%= form_for(@product) do |f| %>
   
       <% if @product.errors.any? %>
  
positive.code:     <%= f.fields_for :volume_costs do |vc_builder| %>
        <div class="form-group row">
          <label class="col-1 col-form-label"><%= vc_builder.label "Volume" %></label>
          <%= vc_builder.number_field :volume %>
          <div class="input-group-addon">ozs</div>
  
          <label class="col-1 col-form-label"><%= vc_builder.label "Cost" %></label>
          <div class="input-group-addon">$</div>
          <%= vc_builder.number_field :cost %>
        </div>  
      <% end %>
  
  
negative.code:     <div class="form-group row">
        <label class="col-1 col-form-label"><%= f.label "Category" %></label>
        <div class="col-8">
          <%= f.collection_select(:category_id, Category.all, :id, :name, {:selected => params[:category_id]}) %>
        </div>
      </div>
  
      <div class="form-check row">
        <label class="col-1 col-form-label"><%= f.label "Oils" %></label>
        <div class="container-fluid">
          <%= f.collection_check_boxes(:oil_ids, Oil.all, :id, :name) do |b| %>
            <div class="d-inline-block col-md-3">
              <%= b.check_box :class => "label-checkbox" %>
              <%= b.label %>
            </div>
          <% end %>
        </div>
      </div>
  