*,*:before ,*::after{
    box-sizing: border-box;
}

:root{
    --hue:200;
    --saturation:50%;
    --foreground-color:hsl(var(--hue),var(--saturation),75%);
    --background-color:hsl(var(--hue),var(--saturation),20%);
}
body{
    margin: 0;
    background-color: var(--background-color);
    overflow: hidden;

}
.paddle{
    --position:50;

    position: absolute;
    background-color: var(--foreground-color);
    top: calc(var(--position) * 1vh);
    transform: translateY(-50%);
    width: 1vh;
    height: 10vh;
}
.paddle.right{
    right: 1vw;
}
.paddle.left{
    left: 1vw;
}
.ball{
    --x:50;
    --y:50;

    position: absolute;
    background-color: var(--foreground-color);
    left: calc(var(--x) * 1vw);
    top: calc(var(--y) * 1vh);
    border-radius: 50%;
    transform: translate(-50% ,-50%);
    width: 2.5vh;
    height: 2.5vh;
}

.score{
    display: flex;
    justify-content: center;
    font-weight: bold;
    font-size: 7vh;
    color: var(--foreground-color);
}
.score > * {
flex-grow: 1;
flex-basis: 0;
padding:  0 2vh;
margin: 1vh 0;
opacity: .5;
}
.score > :first-child{
    text-align: right;
    border-right:  .5vh solid var(--foreground-color);
}