body, html {
  margin: 0;
  padding: 0;
  background: #87ceeb;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

#gameCanvas {
  display: block;
  margin: 0 auto;
  background: linear-gradient(to top, #3a7bd5, #00d2ff);
  border: 3px solid #333;
  image-rendering: pixelated;
}