html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: sans-serif;
}

#map {
  height: 100vh;
}

#locate-btn,
#track-btn {
  position: absolute;
  left: 10px;
  z-index: 1000;
  background: white;
  padding: 6px 12px;
  border: 1px solid #aaa;
  border-radius: 6px;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0,0,0,0.3);
}

#locate-btn {
  bottom: 10px;
}

#track-btn {
  bottom: 50px;
}

.popup-content {
  max-width: 200px;
}

.popup-content button {
  margin-top: 5px;
  padding: 5px 10px;
}