body {
  background: #ddd;
}

#Main {
  max-width: 1200px;
  margin: auto;
}

#Graph {
  height: 400px;
  border: 1px solid #333;
  background: #f8f8f8;
}

nav {
  background: #333;
  padding: 0.5em;
}

nav button {
  font: 15px verdana;
}

.selected {
  background: #cfc;
}

div.marker {
  float: left;
  width: 16px;
  margin-right: 0.3em;
}