.grid{
    position: absolute;
    width: 560px;
    height: 300px;
    border: 1px solid black;
    right: 50%;
    transform: translate(50%);
}
.block{
    position: absolute;
    width: 100px;
    height: 20px;
    background: blue;
}
.user{
    position: absolute;
    width: 100px;
    height: 20px;
    background: purple;
}
.ball{
    position: absolute;
    width: 20px;
    height: 20px;
    border-radius: 10px;
    background: red;
}
#score{
    height: 50px;
    display: grid;
    place-items: center;
}