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<div class="wrapper cf">
  <div class="content">
   <h1>Scroll Down!</h1>
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  <div class="sidebar">
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/* apply a natural box layout model to all elements, but allowing components to change */
html {
  box-sizing: border-box;
*, *:before, *:after {
  box-sizing: inherit;
body {
  background-color: #F5F7FA;
  line-height: 1.2;
 * For modern browsers
 * 1. The space content is one way to avoid an Opera bug when the
 *    contenteditable attribute is included anywhere else in the document.
 *    Otherwise it causes space to appear at the top and bottom of elements
 *    that are clearfixed.
 * 2. The use of `table` rather than `block` is only necessary if using
 *    `:before` to contain the top-margins of child elements.
.cf:after {
    content: " "; /* 1 */
    display: table; /* 2 */

.cf:after {
    clear: both;

 * For IE 6/7 only
 * Include this rule to trigger hasLayout and contain floats.
.cf {
    *zoom: 1;
.wrapper {
  width: 100%;
  max-width: 600px;
  margin-right: auto;
  margin-left: auto;
  margin-top: 60px;
  margin-bottom: 200px;
.content {
  padding: 0 15px;
  width: 380px;
.content h1 {
  margin-top: 0;
.content p,
.sidebar p{
  font-family: "BLOKKNeue-Regular";
.sidebar {
  padding: 20px;
  width: 170px;
  background-color: #434A54;
  color: #fff;
.sidebar h3 {
  margin: 0;
.sidebar {
  float: left;

/* The sticky */
.sidebar {
  position: -webkit-sticky;
  position: sticky;
  top: 0;