body {
  margin: 5% auto;
  background: #f8f8f8;
  color: #222;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.8;
  text-shadow: 0 1px 0 #ffffff;
  max-width: 73%;
}

code {
  background: white;
}

a {
  border-bottom: 1px solid #222;
  color: #222;
  text-decoration: none;
}

a:hover {
  border-bottom: 0;
}

p.error {
  color: red
}

p.message {
  color: green
}

table.devices, .devices td, .devices th {
  padding: .5em;
  border: 1px solid black;
  border-collapse: collapse;
}

td.invisible {
  background-color: #fbb
}

td.visible {
  background-color: #bfb
}