remove outer label of checkbox in ruby

I'm using ruby on my project . I need costume style for check boxes .

please find below code

<%= f.input :category_ids, :as => :check_boxes do %> <%= f.collection_check_boxes :category_ids, Category.order(:name), :id, :name do |b| b.label { b.check_box + b.text } end %><% end %>`

Using above code Im getting out like

<label for="property_space_amenities_space_amenities_2"><input type="checkbox" value="2" name="property[space_amenities][space_amenities][]" id="property_space_amenities_space_amenities_2">Internet connectivity</label>

form this im not able give custom style for this

i want output like below

<label class="control-label" for="user_login">Login</label> <input class="form-control" id="user_login" name="user[login]" type="text" />

Please help me in this