body {
  font-family: 'lato', 'oxygen', 'open sans';
}

h1, h3 {
  text-align: center;
}

button {
  font: 1.1em 'lato', sans-serif;
  width: 100px;
  height: 50px;
  background: white;
  border: 2px solid black;
  transition: background 0.5s ease-in-out;
  -webkit-transition: background 0.5s ease-in-out;
}

button:hover {
  color: white;
  background: grey;
  cursor: pointer;
}

button:active {
  color: white;
  transition: background 0s ease-in-out;
  -webkit-transition: background 0s ease-in-out;
  background: black;
}

#buttons {
  display: flex;
  justify-content: center;
}

#tracker {
  display: inline-block;
  position: relative;
}

#subways {
  position: absolute;
  z-index: 2;
}

#map {
  position: absolute;
  z-index: 1;
}