* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  background: #2a2a3a;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: sans-serif;
  overflow: hidden;
  touch-action: none;
}

#game {
  border: 3px solid #5a4a3a;
  border-radius: 8px;
  cursor: pointer;
  image-rendering: auto;
  /* only shrink on small viewports, never scale up */
  max-width: calc(100vw - 6px);
  max-height: calc(100vh - 6px);
  max-height: calc(100dvh - 6px);
}

html, body {
  overflow: hidden;
  width: 100%;
  height: 100%;
}