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                <div class="container">
  <div class="secondary-content">
    <div class="content-inner">
      Lorem ipsum dolor sit amet, consectetur adipiscing elit. Suspendisse id lectus quis metus sagittis interdum vel vel mauris. Sed ex risus, gravida et magna at, porttitor vehicula turpis. Praesent convallis, purus interdum ultrices ultricies, turpis ligula tincidunt elit, suscipit condimentum arcu massa in lacus. In eget tempus mi. Aenean sed tellus vulputate, pulvinar turpis a, placerat lacus. Duis ut urna sed tortor auctor ornare. Aenean interdum velit aliquam tellus consequat, nec maximus velit lobortis. Vestibulum massa metus, facilisis ut lectus eget, cursus rhoncus massa.

Integer quam nisl, vehicula sed nibh id, finibus sagittis arcu. Maecenas semper faucibus urna egestas eleifend. Sed nec gravida felis. Praesent blandit erat eu enim consectetur, non mollis purus aliquet. Nunc eu nisi non ante volutpat mollis sed quis lorem. Cras a quam tellus. Vestibulum viverra rutrum risus at convallis. Donec non nisl quis augue laoreet euismod vel at diam. Ut eu arcu in ligula facilisis semper eget sit amet justo. Aenean vel bibendum enim. Duis pharetra leo nec quam viverra, a ullamcorper lorem eleifend. Sed quis lorem pulvinar, sollicitudin sem maximus, elementum metus. Mauris fringilla, urna eu tincidunt placerat, quam mauris luctus libero, nec congue massa arcu ac enim. Nullam eget nunc eu eros auctor imperdiet at ac ex.

Fusce ac magna eu sapien venenatis porttitor et nec mi. Sed eget nibh consectetur, fermentum tortor et, maximus ligula. Vestibulum luctus cursus porta. Morbi in erat eu libero congue consequat ac quis tellus. Sed vehicula efficitur ipsum ut ullamcorper. Mauris lobortis elementum porttitor. Praesent hendrerit purus at sodales cursus. Aenean tempus congue lectus, id pellentesque ante sollicitudin sed. Vestibulum id dapibus dui. Etiam leo sem, finibus suscipit congue eget, laoreet convallis nibh. Pellentesque nunc turpis, sagittis rhoncus tempor vitae, scelerisque porta quam. In tortor massa, ullamcorper nec nisl a, convallis interdum purus. Phasellus lacinia eros vitae ante lacinia, sit amet tristique purus feugiat. Sed interdum eros purus, ut lacinia ante sodales eget. Suspendisse porttitor molestie urna sed congue.

Aliquam faucibus nibh urna, eu ornare mauris posuere et. Sed tempor scelerisque erat. Suspendisse in fermentum purus, nec tempus lorem. Quisque varius pharetra egestas. Ut leo sapien, maximus non risus at, bibendum viverra odio. Aenean fringilla nec eros non dictum. Duis tincidunt massa malesuada nibh posuere, eget facilisis sem vulputate. Vestibulum ante ipsum primis in faucibus orci luctus et ultrices posuere cubilia Curae; Phasellus erat risus, egestas id turpis a, consectetur condimentum arcu.

Quisque sit amet magna cursus dolor aliquet pellentesque. Mauris porttitor hendrerit ligula, non commodo massa condimentum quis. Praesent eget efficitur nisi, ac efficitur est. Sed consequat sapien eget neque dictum rutrum. Maecenas sit amet justo id libero ultrices volutpat. Cras non velit dolor. Etiam nunc sem, semper nec pharetra eu, convallis eget risus. Nam a arcu mollis, commodo ipsum quis, venenatis dui. Interdum et malesuada fames ac ante ipsum primis in faucibus. Vivamus luctus congue lorem tempor consectetur. Nunc mauris leo, efficitur a lorem nec, varius mattis nisi. Pellentesque ut lacus dui.
  <div class="main-content">


                .container {
  position: relative;
.main-content {
  width: 80%;
  margin-left: 20%;
  height: 300px;
  background-color: red;
.secondary-content {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 20%;
  overflow-y: scroll;


Save your sass for CSS. Everywhere else be kind.