* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 18%, rgba(155, 188, 15, 0.14), transparent 32%),
    linear-gradient(180deg, #182820 0%, #081820 100%);
  color: #d8f7a7;
  font-family: "MS Gothic", "Osaka-Mono", "Courier New", monospace;
}

.game-shell {
  width: min(100vw, 880px);
  padding: 24px;
}

h1 {
  margin: 0 0 12px;
  color: #d8f7a7;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0;
  text-shadow: 0 0 8px rgba(155, 188, 15, 0.45);
}

h1 span {
  color: #88c070;
  font-size: 14px;
}

canvas {
  display: block;
  width: 800px;
  height: 600px;
  max-width: 100%;
  aspect-ratio: 4 / 3;
  background: #9bbc0f;
  border: 8px solid #346856;
  border-radius: 8px;
  box-shadow:
    0 0 0 4px #081820,
    0 18px 48px rgba(0, 0, 0, 0.55),
    inset 0 0 34px rgba(8, 24, 32, 0.42);
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}