title: Customizing simple_form boolean input
body: <p>To add some markup to a boolean input (checkbox), I am trying to create a custom input like this:</p>
  
  <pre><code>class BooleanWithIconInput &lt; SimpleForm::Inputs::BooleanInput
    def input(wrapper_options)
      super
    end
  end
  </code></pre>
  
  <p>The problem is, that this input is already displayed differently, since it is missing a <code>&lt;div class="checkbox"&gt;</code> container and it adds classes like <code>control_label</code> and <code>form_control</code>.</p>
  
  <p>Why is that happening, and how can I get the same behaviour?</p>