html, body {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  background: #fdfdfd;
  height: 100%;
  overflow: hidden;
}

#gameContainer {
  position: relative;
  width: 800px;
  margin: 0 auto;
  text-align: center;
}

canvas {
  border: 1px solid #ccc;
  background: #fafafa;
  display: block;
  margin: 0 auto;
}

#ui {
  display: flex;
  justify-content: space-around;
  padding: 10px;
  font-size: 18px;
  color: #333;
}

.overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

button {
  padding: 10px 20px;
  font-size: 18px;
  border: none;
  background: #007acc;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  margin-top: 10px;
}

button:hover {
  background: #005da0;
}