body {
  margin: 0;
  font-family: Arial, sans-serif;
}

header {
  background: #4CAF50;
  color: white;
  padding: 1em;
  text-align: center;
}

#map {
  height: 80vh;
  width: 100%;
}

.control-panel {
  text-align: center;
  padding: 1em;
  background-color: #f1f1f1;
}

button {
  margin: 5px;
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}