html, body {
     margin: 0;
     text-align: center;
}
 #fullscreen {
     position: fixed;
     top: 0;
     right: 0;
     bottom: 0;
     left: 0;
     display: flex;
     justify-content: center;
     align-items: center;
}
 #fullscreen canvas {
     object-fit: contain;
     max-height: 100%;
     max-width: 100%;
}


h1 {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  color: #858585;
  font-size: 15px;
  font-family: 'Montserrat', sans-serif;
  font-weight: 400;
  text-align: center;
}