body {
  font-family: Tahoma, Verdana, Segoe, sans-serif;
  text-align: left;
}

h1, h4 {
  text-align: center;
}

section {
  margin-left: 10px;
  padding-left: 10px;
  margin-right: 10px;
  padding-right: 10px;
}

section > section {
  border-left: 1px solid green;
}

footer {
  clear: both;
  text-align: left;
}