body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  margin: 0;
  background-color: #f0f0f0;
  position: relative;
}
.target {
  width: 50px;
  height: 50px;
  background-color: red;
  border-radius: 50%;
  position: absolute;
}
#score {
  position: fixed;
  top: 10px;
  left: 10px;
  font-size: 24px;
  font-weight: bold;
  color: white;
  background-color: rgba(0, 0, 0, 0.7);
  padding: 10px 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  display: none;
}
#timer {
  position: fixed;
  top: 10px;
  right: 10px;
  font-size: 24px;
  font-weight: bold;
  color: white;
  background-color: rgba(0, 0, 0, 0.7);
  padding: 10px 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
  display: none;
}
#startScreen, #endScreen {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  background-color: rgba(255, 255, 255, 0.9);
  width: 100%;
  height: 100%;
  z-index: 10;
}
#endScreen {
  display: none;
}
button {
  padding: 10px 20px;
  font-size: 16px;
  margin-top: 20px;
  cursor: pointer;
  border: none;
  border-radius: 5px;
  background-color: #007BFF;
  color: white;
  box-shadow: 0 5px 10px rgba(0, 123, 255, 0.3);
  transition: background-color 0.3s;
}
button:hover {
  background-color: #0056b3;
}