body {
  text-align: center;
  background: linear-gradient(135deg, #011F3F, #1B3B6F);
  color: #FEF2BF;
  font-family: 'Press Start 2P', cursive;
  margin: 0;
  padding: 50px 0 0 0;
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#level-title {
  font-size: 3.5rem;
  margin: 20px 0;
  text-shadow: 2px 2px 5px rgba(0, 0, 0, 0.5);
  line-height: 80px;
}

.container {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 20px;
  width: 80%;
  max-width: 800px;
  margin: auto;
  margin-top: 50px;
}

.btn {
  margin: 15px;
  height: 150px;
  width: 150px;
  border: none;
  border-radius: 15%;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.btn:hover {
  transform: scale(1.1);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.game-over {
  background: linear-gradient(135deg, #FF0000, #8B0000);
  opacity: 0.9;
  animation: shake 0.5s;
}

@keyframes shake {
  0%, 100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  50% {
    transform: translateX(5px);
  }
  75% {
    transform: translateX(-5px);
  }
}

.red {
  background: radial-gradient(circle, #FF4D4D, #B22222);
}

.green {
  background: radial-gradient(circle, #32CD32, #006400);
}

.blue {
  background: radial-gradient(circle, #1E90FF, #00008B);
}

.yellow {
  background: radial-gradient(circle, #FFD700, #FFA500);
}

.pressed {
  box-shadow: 0 0 20px white;
  background-color: grey;
  transform: scale(0.9);
}