@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,800,400italic);
.main-nav {
  text-align: center; }
  .main-nav ul {
    list-style: none;
    display: -webkit-inline-flex;
    display: -ms-inline-flexbox;
    display: inline-flex;
    border: 2px solid black;
    margin: 1rem 0;
    border-radius: 15px;
    overflow: hidden; }
    .main-nav ul li a {
      display: inline-block;
      padding: 0.5rem 2rem;
      text-decoration: none;
      color: black;
      font-weight: bold; }
      .main-nav ul li a svg {
        display: inline-block;
        width: 24px;
        height: 24px;
        margin-right: 0.4rem; }
      .main-nav ul li a svg, .main-nav ul li a span {
        vertical-align: middle; }
    .main-nav ul li.active a {
      background: black;
      color: white; }
    .main-nav ul li.active svg {
      fill: white; }

.tabs .tab {
  display: none; }
  .tabs .tab.active {
    display: block; }

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box; }

body {
  font-family: 'Open Sans', sans-serif; }

.main-header {
  text-align: center;
  background: black;
  color: white;
  padding: 3rem 5rem 3rem; }
  .main-header h1 {
    margin: 0 0 0.5rem 0; }
  .main-header a {
    color: white; }

h1 {
  font-size: 3rem;
  margin: 0 0 1rem 0; }

p {
  margin: 0 0 0.5rem 0; }

main.tabs {
  max-width: 800px;
  margin: 0 auto;
  padding: 20px; }

.speaker-list {
  list-style: none;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-justify-content: space-between;
      -ms-flex-pack: justify;
          justify-content: space-between; }
  .speaker-list li {
    width: 32%;
    text-align: center;
    border: 2px solid black;
    border-radius: 4px;
    padding: 40px 10px; }

.schedule dt {
  font-weight: bold; }

.schedule dt ~ dt {
  margin-top: 1rem; }