/* sidebar menu */
.nav-bar {
  height: 100%;
  /* full height instead of auto */
  width: 160px;
  position: fixed;
  /* stay in place on scroll */
  z-index: 1;
  /* stay on top */
  top: 0;
  /* stay at the top */
  left: 0;
  background-color: #111;
  overflow-x: hidden;
  /* disable horizontal scroll */ }
  .nav-bar header {
    padding: 6px 8px 6px 16px;
    font-size: 16px;
    line-height: 2;
    color: white; }
  .nav-bar a {
    padding: 6px 8px 6px 16px;
    text-decoration: none;
    font-size: 16px;
    line-height: 2;
    color: #818181;
    display: block; }
  .nav-bar a:hover {
    color: #f1f1f1; }

main {
  margin-left: 160px;
  /* same as the width of the sidebar */
  padding: 0px 10px; }

/* prevent browser style-sheets from over-riding header sizes */
h1 {
  font-size: 2em; }

h2 {
  font-size: 1.5em; }

code {
  position: relative;
  margin: 10px 0px 10px 20px;
  display: block; }

/* for smaller screens */
@media screen and (max-height: 450px) {
  nav-bar {
    padding-top: 15px; }
    nav-bar a {
      font-size: 18px; } }