body {
    padding:0;
    margin:0;
    overflow:hidden;
	height: 600px;
}
canvas {
    padding:0;
    margin:0;
}
div.btnbg {
    position:fixed;
    left:0;
    top:0;
}

.nav-arrow {
  width: 40px;
  height: 50px;
  background: rgba(145, 145, 145, 0.664);
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  opacity: 0.05;
}

.nav-arrow a{
  font-size: 45px;
  text-decoration: none;
  color: rgb(255, 255, 255);
}

.nav-arrow:hover {
	opacity: 1;
}

.nav-arrow:nth-of-type(2) {
  left: auto;
  right: 0;
}