style.css

* {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  color: white;
  margin: 0px;
  padding: 0px;
}

body {
  width: 100vw;
  height: 100vh;
  background: rgb(54, 58, 46);

  box-sizing: border-box;
  overflow-x: hidden;
}

.canvasWrapper {
  width: 100vw;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;

  margin-left: auto;
  margin-right: auto;

  position: relative;
}

#canvas {
  width: 100%;
  height: 100%;
  cursor: pointer;
  /*border: 1px red solid;*/

  display: block;
  box-sizing: border-box;
}

#loading {
  position: absolute;
  width: 4em;
  height: 4em;
  z-index: 1000;
  display: flex;
  justify-content: center;
  align-items: center;

  background: red;
}