html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  background: aliceblue;
  font-family: Arial, sans-serif;
}
#network {
  width: 100%;
  height: calc(100% - 60px);
  background: #fff;
}
#titlebar {
  padding: 10px 16px;
  background: aliceblue;
  color: black;
  font-size: 16px;
}
#subtitle {
  font-size: 12px;
  color: black;
}

/* Navigation button styles for vis-network */
div.vis-network div.vis-navigation div.vis-button {
  background-color: aliceblue;
  border: 1px solid #ccc;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}
div.vis-network div.vis-navigation div.vis-button:hover {
  background-color: #e0e0e0;
}
div.vis-network div.vis-navigation div.vis-button:active {
  background-color: #d0d0d0;
}