html, body {
  margin: 0;
  padding: 0;
  height:100%;
  width:100%;
  background-attachment: fixed;
}
canvas {
  display: block;
  position:fixed;
  width:110%;
  height:110%;
    background: url(https://image.freepik.com/free-photo/empty-wall-with-wooden-floor_1339-4850.jpg);
    background-size: 100% 100%;


}