body {
    overflow:hidden;
    background-color: whitesmoke;
}

#canvas1 {
    padding: 0;
    margin: auto;
    display: block;
    width: 1500px;
    height: 840px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
  }