body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f0f8ff;
}

#gallery img {
  display: block;
  margin: 20px auto;
  border: 3px solid #333;
  max-width: 100%;
  height: auto;
}

button {
  padding: 10px 20px;
  margin: 5px;
  font-size: 16px;
  cursor: pointer;
}

#counter, #score {
  font-size: 14px;
  color: #555;
  margin: 6px 0;
}