/* reset styles */
* {
  padding: 0;
  border: 0;
  margin: 0;
}

/* overview */
html, body {
  margin: 0 2em;
  background-color: black;
  color: white;
}

h1 {
  text-align: center;
  margin: 1em 0;
}

div {
  border: 2px solid gray;
  padding: 1em 2em;
  margin: 1em 0;
}

/* system map css */
#map details {
  margin: 1em 0;
}

#map details p {
  margin: .5em 0;
}

#map summary {
  font-weight: bold;
  font-size: 1.5em;
}
#map summary:hover {
  cursor: pointer;
}