style.css

body {
    margin: 0;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #000;
}

#gameArea {
    position: relative;
    width: 100%;
    height: 100%;
    background-color: #333;
}

#paddleLeft, #paddleRight {
    position: absolute;
    width: 10px;
    height: 80px;
    background-color: #fff;
}

#paddleLeft {
    left: 10px;
    top: 50%;
    transform: translateY(-50%);
}

#paddleRight {
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
}

#ball {
    position: absolute;
    width: 15px;
    height: 15px;
    background-color: #fff;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}