* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  height: 100%;
  background: #061018;
  color: #e7f2ff;
  font-family: "WenQuanYi Zen Hei", "文泉驿正黑", "Unifont", sans-serif;
}

body {
  display: grid;
  place-items: center;
  overflow: hidden;
  overscroll-behavior: none;
  touch-action: none;
  user-select: none;
}

canvas {
  width: min(100vw, calc(100vh * 480 / 720));
  height: min(100vh, calc(100vw * 720 / 480));
  background: #0d3b66;
  touch-action: none;
  box-shadow:
    0 0 0 3px #14283c,
    0 18px 70px rgba(0, 0, 0, 0.45);
}