body {
  text-align: center;
}

h1 {
  color: #333;
}

#gameContainer {
  margin-top: 50px;
  position: relative;
}

#score,
#highScore,
#timer {
  font-size: 20px;
  color: #333;
  margin-bottom: 10px;
}

#bubbles {
  position: relative;
  width: 600px;
  height: 400px;
  margin: 0 auto;
  background-color: #ccc;
  border: 2px solid #333;
  border-radius: 10px;
  overflow: hidden;
}

.bubble {
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background-color: #f00;
  cursor: pointer;
  transition: top 0.5s ease-in-out, left 0.5s ease-in-out;
}

.bubble:hover {
  background-color: #f00;
  transform: scale(1.2);
}

#scoreValue,
#highScoreValue {
  font-weight: bold;
}

#timerValue {
  font-weight: bold;
  animation: blink 1s infinite;
}

.start-button {
  padding: 10px 20px;
  font-size: 16px;
  background-color: #333;
  color: #fff;
  border: none;
  cursor: pointer;
  margin-top: 20px;
}

@keyframes countdown {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}

@media (max-width: 768px) {
  #bubbles {
    width: 80%;
    height: 300px;
  }
}