HTML

icheck js

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/iCheck/1.0.3/skins/all.min.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/iCheck/1.0.3/icheck.min.js"></script>
<script>
(function($) { 
$(document).ready(function(){
  $('input').iCheck({
    checkboxClass: 'icheckbox_futurico',
    radioClass: 'iradio_futurico',
    increaseArea: '20%' // optional
  });
});
})(jQuery);
</script>