body {
  padding: 0;
  margin: 0;
}

#bicycle {
  background-image: url(/bicycle.jpg);
  background-size: cover;
  background-repeat: no-repeat;
  background-position: bottom center;
  height: 100vh;
  width: 100vw;
  top: 0;
  left: 0;
  position: fixed;
}

iframe {
  position: fixed;
  top: 28%;
  left: 50%;
  transform: translate(-50%, -50%);
  border: none;
  height: 70vmin;
  width: 70vmin;
  filter: grayscale(1);
  opacity: 0.1;
}