body {
  overflow: hidden;
  background: #111;
}

button {
  position: absolute;
  bottom: 5%;
  left: 50%;
  transform: translateX(-50%);
  border: 1px solid white;
  border-radius: 5px;
  font-size: 0.9rem;
  padding: 0.5rem 0.9em;
  background: #000000;
  color: white;
  -webkit-font-smoothing: antialiased;
  font-weight: bold;
  cursor: pointer;
  transition: all .5s;
}

button:hover {
  background: #ffffff;
  color: #000000;
}