/*body {
  background: #f1f1f1;
  margin: 0px;
  padding: 0px; 
  text-align: center;
}*/

/*body {
  overflow: hidden;     supprimer barres de défilement
  user-select: none; 
}*/

 html, body {
   height: 100%;
   margin: 0; 
   display: flex; 
   justify-content: center;
 }

 canvas {
   width: 100%;
   height: 100%;
   display: block;*/
 }