html,
body {
  height: 100%;
  margin: 0;
  padding: 0px;
  overflow: hidden;
}

#canvas {
  width: 100%;
  height: 100%;
}

.back-button {
  position: fixed;
  width: 50px;
  height: 50px;
  top: 15px;
  background-color: #FFDF4B;
  color: #fff;
  border-radius: 50px;
  text-align: center;
  font-size: 30px;
  left: 15px;
  z-index: 100;
}

.my-float {
  margin-top: 10px;
}