```ruby
# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  config.wrappers :foundation, class: :input, hint_class: :field_with_hint, error_class: :error do |b|
    b.use :html5
    b.use :placeholder
    b.optional :maxlength
    b.optional :pattern
    b.optional :min_max
    b.optional :readonly
    b.use :label_input
    b.use :error, wrap_with: { tag: :small }

    # Uncomment the following line to enable hints. The line is commented out by default since Foundation
    # does't provide styles for hints. You will need to provide your own CSS styles for hints.
    # b.use :hint,  wrap_with: { tag: :span, class: :hint }
  end

  # CSS class for buttons
  config.button_class = 'button'

  # CSS class to add for error notification helper.
  config.error_notification_class = 'alert-box alert'

  # The default wrapper to be used by the FormBuilder.
  config.default_wrapper = :foundation
end
```

Configure simple_form to use error class for inputs with error
user
```ruby
# Use this setup block to configure all options available in SimpleForm.
SimpleForm.setup do |config|
  config.wrappers :foundation, class: :input, hint_class: :field_with_hint, error_class: :error do |b|
    b.use :html5
    b.use :placeholder
    b.optional :maxlength
    b.optional :pattern
    b.optional :min_max
    b.optional :readonly
    b.use :label_input
    b.use :error, wrap_with: { tag: :small, class: 'error' }

    # Uncomment the following line to enable hints. The line is commented out by default since Foundation
    # does't provide styles for hints. You will need to provide your own CSS styles for hints.
    # b.use :hint,  wrap_with: { tag: :span, class: :hint }
  end

  # CSS class for buttons
  config.button_class = 'button'

  # CSS class to add for error notification helper.
  config.error_notification_class = 'alert-box alert'

  # The default wrapper to be used by the FormBuilder.
  config.default_wrapper = :foundation
end
```
assistant