html,body {
  margin: 0;
  position: relative;
  min-height: 100vh;
}
canvas {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  max-width: 100%;
  max-height: 100%;
  object-fit: scale-down;
  filter: drop-shadow(0.3rem 0.3rem 0.3rem rgba(0,0,0,0.43));
  z-index: 3;
}
#p5_loading {
  color: #FFF;
  font-family: Arial, Helvetica, sans-serif; 
  height: 50%;
  width: 50%;
  overflow: auto;
  margin: 30% 40%;
  position: absolute;
  z-index: 1;
}