Sticky Kit Using Bootstrap 4

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.5/css/bootstrap.min.css">
<script src="https://cdn.rawgit.com/leafo/sticky-kit/master/dist/sticky-kit.min.js"></script>
<nav class="navbar navbar-fixed-top navbar-light bg-faded">
  <button class="navbar-toggler hidden-lg-up" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>
  <div class="collapse navbar-toggleable-md" id="navbarResponsive">
    <a class="navbar-brand" href="#">Navbar</a>
    <ul class="nav navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Link</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="http://example.com" id="responsiveNavbarDropdown" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
        <div class="dropdown-menu" aria-labelledby="responsiveNavbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
    <form class="form-inline float-lg-right">
      <input class="form-control" type="text" placeholder="Search">
      <button class="btn btn-outline-success" type="submit">Search</button>
    </form>
  </div>
</nav>


<div class="container">

  <div class="row">
    <div class="col-sm-4" id="sidebar">
      I'm on Top of #sidebar
      <span class="btm">I'am in bottom of #sidebar</span>
    </div>
    <div class="col-sm-8" id="main">
      I'm on...

CSS

body {
  margin-top: 70px
}

#sidebar {
  background: yellow;
  height: 300px;
}

#main {
  background: green;
  height: 1900px;
}

.btm {
  position: absolute;
  bottom: 0;
  display: block;
}

JavaScript

// SMART SCROLLING
if ($(window).width() < 768) {
  //alert('Less than 960');
} else {
  $('#sidebar').stick_in_parent()
    .on('sticky_kit:stick', function(e) {
      $('#sidebar').css('width', '33.3%');
      $('#main').css('width', '66.6%');
    }).on('sticky_kit:unstick', function(e) {
      $('#sidebar').css('width', '');
      $('#main').css('width', '');
    });
  //alert('More than 960');
}