article section,
header,
footer section {
  width: 960px;
  margin: 0 auto;
}

header {
  padding: 50px 25px;
  box-shadow: none;
}

nav {
  margin: 0;
  padding: 0;
}

nav ul {
  width: 960px;
  margin: 0 auto;
  float: none;
  overflow: hidden;
}