* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #161b2d;
  color: #fff;
  font-family: "Arial Rounded MT Bold", "Trebuchet MS", Arial, sans-serif;
}

body {
  display: grid;
  place-items: center;
}

.phone-shell {
  position: relative;
  width: min(100vw, 56.25vh);
  height: min(100vh, 177.78vw);
  max-width: 540px;
  max-height: 960px;
  overflow: hidden;
  background: #18213d;
  touch-action: manipulation;
}

#gameCanvas {
  width: 100%;
  height: 100%;
  display: block;
}