body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    background-color: #121212;
    color: white;
    font-family: Arial, sans-serif;
}

#game-container {
    position: relative;
    width: 600px;
    height: 400px;
    border: 2px solid white;
    overflow: hidden;
    background-color: #1e1e1e;
}

#ball {
    position: absolute;
    width: 15px;
    height: 15px;
    background-color: #ff4081;
    border-radius: 50%;
}

.paddle {
    position: absolute;
    width: 10px;
    height: 100px;
    background-color: #76ff03;
}

#paddle-left {
    left: 0;
}

#paddle-right {
    right: 0;
}

.score {
    position: absolute;
    top: 10px;
    font-size: 24px;
}

#left-score {
    left: 10px;
}

#right-score {
    right: 10px;
}

#start-btn {
    margin-top: 20px;
    padding: 10px 20px;
    background-color: #ff4081;
    border: none;
    color: white;
    font-size: 16px;
    cursor: pointer;
}

.popup {
    display: flex;
    justify-content: center;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1000;
}

.popup-content {
    background-color: #1e1e1e;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.close-popup {
    cursor: pointer;
    float: right;
    font-size: 24px;
}