style.css

*{
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.container{
    background-color: beige;
    width: 800px;
    height: 600px;
    box-shadow: 1px 1px 1px 1px rgba(0,0,0,0.1);
    position: relative;
    overflow: hidden;
    border-radius: 5px;
}

.score{
    background-color: darkslateblue;
    width: 55px;
    height: 30px;
    position: absolute;
    left: 745px;
    border-radius: 5px;
    line-height: 30px;
    text-align: center;
    color: aliceblue;
}

.ball{
    width: 40px;
    height: 40px;
    background-color: cadetblue;
    border-radius: 30px;
    position: absolute;
    top: 0px;
    left: 0px;
}

.raquette{
    width: 60px;
    height: 20px;
    background-color: darkslategrey;
    position: absolute;
    top: 580px;
    left: 10px;
    border-radius: 1em;
}

.game-over{
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    position: absolute;
    line-height: 500px;
    text-align: center;
    font-size: xx-large;
    display : none;
    color : wheat;
}

.try-again{
    position: absolute;
    top: 300px;
    left: 350px;
    border: 2px solid wheat;
    width: 100px;
    height: 30px;
    border-radius: 8px;
    background-color: wheat;
    line-height: 30px;
    text-align: center;
    display : none;
}