@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: 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: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}
.speaker-list li {
  width: 32%;
  margin: 0 0 4% 0;
  text-align: center;
  border: 2px solid black;
  border-radius: 4px;
  padding: 40px 10px;
}
.speaker-list li span {
  display: block;
}

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