html{
  height: 100%; 
  width: 100%;
}

body{
  
  height: 100%; 
  width: 100%; 
  margin: 0; 
  padding: 0; 
  background-color: #fff; /*333*/
}

canvas{
  display: block; 
  max-width: 100%; 
  max-height: 100%; 
  padding: 0; 
  margin: auto; 
  display: block; 
  position: absolute; 
  top: 0; 
  bottom: 0; 
  left: 0; 
  right: 0; 
  object-fit: contain;
}