canvas {
  position: absolute;
  top: 0px;
  bottom: 0px;
  left: 0px;
  right: 0px;
  margin: auto;
  box-shadow: 2px 2px 10px white;
  border-radius: 10px;
  cursor: pointer;
}

button {
  position: absolute;
  top: 0px;
  bottom: 0px;
  left: 0px;
  right: 0px;
  margin: auto;
  cursor: pointer;
}

#facebook {
  display: none;
  top: 150px;
  width: 200px;
  height: 80px;
  font-size: 1.3em;
  color: white;
  background-color: #3c5698;
  border: none;
  z-index: 10000;
}

#facebook:hover {
  background-color: #31467c;
}