body{
  background-color: #e2bef1;
  margin: 0;
  overflow: hidden;
  cursor: crosshair;
}

canvas{
  touch-action: none;
}

.box1{
  width: 100%;
  height: 100%;            
  position: absolute;  
}
#down{
  z-index:15;
}
#up{
  z-index:10;
}