*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: "Noto Sans JP", sans-serif;
  background: #111;
  color: #fff;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
  width: 100%;
  padding: 8px 16px;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
  font-size: 12px;
}

#app {
  width: 100vw;
  height: 100vh;
}

canvas {
  display: block;
}