* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Arial', sans-serif;
  background-color: #f4f4f4;
  color: #333;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  overflow: hidden;
}

.container {
  text-align: center;
  background-color: #fff;
  padding: 2rem;
  border-radius: 15px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  color: #ffcc00;
}

.difficulty {
  margin-bottom: 1rem;
}

.difficulty label {
  font-size: 1rem;
  margin-right: 0.5rem;
}

#difficulty {
  padding: 0.5rem;
  font-size: 1rem;
  border: 2px solid #ffcc00;
  border-radius: 5px;
  background-color: #fff;
  color: #333;
  outline: none;
}

.game {
  margin-top: 1rem;
}

#score {
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

#lemon-button {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}

#lemon-button img {
  transition: transform 0.1s;
}

#lemon-button:active img {
  transform: scale(0.95);
}

#multiplier {
  font-size: 1.2rem;
  margin-top: 1rem;
}

#upgrade-button, #restart-button, #music-button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  margin-top: 1rem;
  background-color: #ffcc00;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  transition: background-color 0.3s;
}

#upgrade-button:hover, #restart-button:hover, #music-button:hover {
  background-color: #e6b800;
}

#music-button {
  background-color: #4caf50;
  color: white;
}

#music-button:hover {
  background-color: #45a049;
}