index.css

body
{
    margin: 0px;
    overflow: hidden;
    cursor: none;
}
#board
{
    height: 100vh;
    width: 100vw;
    position: relative;
    background-color: skyblue;
}
#enemy
{
    height: 3vh;
    width: 10vw;
    background-color: black;
    position: absolute;
    z-index: 1;
    left: 0px;
    top: 0px;
    transition: left 1ms linear;
}
#player
{
    height: 3vh;
    width: 10vw;
    background-color: black;
    position: absolute;
    bottom: 0px;
    left: 0px;
}
#ball
{
    position: absolute;
    height: 4vh;
    width: 4vh;
    z-index: 0;
    background-color: red;
    top: 48vh;
    left: 48vw;
    border-radius: 50%;
    transition-property: left, top;
    transition-duration: 100ms;
    transition-timing-function: linear;
}
#over{
    height: 100vh;
    width: 100vw;
    z-index: 3;
    position: absolute;
    background-color: grey;
    color: white;
    font-size: 3rem;
    font-family: sans-serif;
    text-align: center;
    padding-top: 40vh;
    display: none;
}
@media all and (orientation: portrait)
{
    #ball{
        height: 3vh;
        width: 3vh;
    }
    #player{
        width: 20vw;
    }
    #enemy{
        width: 20vw;
    }
}