body {
  margin: 0;
  background: #fef3c7;
  font-family: sans-serif;
  text-align: center;
}
#gameCanvas {
  display: none;
  background: #fde68a;
  border: 4px solid black;
  margin: 20px auto;
}
#start-screen, #game-over {
  margin-top: 100px;
}
button {
  padding: 10px 20px;
  font-size: 16px;
}
#score-display {
  font-weight: bold;
  margin-top: 10px;
}

#leaderboard-list {
  margin-top: 1rem;
  font-size: 1rem;
}

#gameCanvas.invincible {
  box-shadow: 0 0 20px 5px gold;
  border: 2px solid yellow;
}