title: Rails simple form check box
body: <p>I have following code :</p>
  
  <pre><code>&lt;%= f.input :accepted_terms_and_conditions, as: :boolean, wrapper_html: { class: 'input-checkbox' } %&gt;
  &lt;/br&gt;
  &lt;%= link_to "View terms and condition", "/terms-and-conditions", target: "_blank"  %&gt;
  </code></pre>
  
  <p>however, the checkbox is not appearing for the simple form. Any suggestions in getting the checkbox. </p>