body {
  margin: 0;
  background-color: #eee;
}

.container {
  margin: 0 auto;
  width: 960px;
}

header {
  background-color: #fff;
}

header h1 {
  margin: 0;
  padding: .75em 0;
  font-size: 1.5em;
}

.global-nav {
  background-color: #333;
}

.global-nav ul {
  overflow: hidden;
  margin: 0;
  padding: 0;
  list-style-type: none;
}

.global-nav li {
  float: left;
  width: 25%;
}

.global-nav a {
  display: block;
  padding: 1em;
  color: #fff;
  text-align: center;
  text-decoration: none;
}

.is-fixed {
  padding-top: 3.5em;
}

.is-fixed .global-nav {
  position: fixed;
  top: 0;
  right: 0;
  left: 0;
}

main {
  padding: 4em 0;
}