html,
   body {
       margin: 0;
       padding: 0;
       background: #000;
       height: 100%;
   }

   #game {
       width: 100%;
       height: 100%;
       display: flex;
   }

   canvas {
       image-rendering: pixelated;
       image-rendering: crisp-edges;
   }

   .help {
       position: fixed;
       background: #111;
       left: 12px;
       bottom: 12px;
       color: #9ff;
       font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
       font-size: 16px;
       opacity: 0.9;
   }

   .help kbd {
       background: #111;
       border: 1px solid #355;
       padding: 1px 6px;
       border-radius: 6px;
   }