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

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: #222;
}

#game-container {
  position: relative;
  width: 600px;
  height: 400px;
  background-color: black;
  border: 5px solid white;
}

.paddle {
  position: absolute;
  width: 10px;
  height: 60px;
  background-color: white;
}

#left-paddle {
  left: 0;
}

#right-paddle {
  right: 0;
}

#ball {
  position: absolute;
  width: 15px;
  height: 15px;
  background-color: white;
  border-radius: 50%;
}

#scoreboard {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  color: white;
  font-size: 20px;
}

#message {
  position: absolute;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 20px;
  border-radius: 10px;
  font-size: 24px;
  font-family: Arial, sans-serif;
  text-align: center;
  display: none;
}

#message.show {
  display: block;
}