html, body {
  overflow: hidden;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center; 
    align-items: center;
}
.preloader {
  position: fixed;
  top: 0px;
  max-width:100%;
  max-height:100%;
  vertical-align: middle;
  min-width: min(100vw, 100vh);
  min-height: min(100vw, 100vh);

  

}

canvas {
  min-width: min(100vw, 100vh);
  min-height: min(100vw, 100vh);
  max-width: min(100vw, 100vh);
  max-height: min(100vw, 100vh);

}