:root{
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}
body {
  max-width: 800px;
  margin: auto;
  padding: 20px;
}
footer {
  color: #555;
}
article {
  border-left: 2px solid #ccc;
  padding-left: 5px;
}
p {
  border-left: 2px dotted #aaa;
  padding-left: 5px;
}