html,
body {
  width: 100vw;
  height: 100vh;
  margin: 0;
  padding: 0;
  background-color: #000;
}

#gameParent {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  height: 100%;
  overflow: hidden;
  position: relative;
}