html,body{
  margin:0;
  background-color: rgba(0, 0, 0, 1);
  overflow-x:hidden;
  overflow-y:hidden;
 }
 
 canvas{
   position: absolute;
   left: 0px;
   right: 0px;
   top: 0px;
   bottom: 0px;
   margin: auto;
 }