html, body {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background-color: #000;
  overflow: hidden;
  touch-action: none;
  background: #000;
    width: 100%;
  height: 100%;
<!--   margin:50px 0;
  text-align:center; -->
}

main {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: white;
}

canvas {
  width: auto !important;
  height: auto !important;
  max-width: 90% !important;
  max-height: 90% !important;
}

  
#canvas3 {
  position: absolute;
    
width: auto !important;
  height: auto !important;
  max-width: 90% !important;
  max-height: 90% !important;

}

#canvas2 {

    padding: 0;
    margin: auto;
    display: block;
    width: 100;
    height: 100% ;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}