#character {
    width: 100px;
    height: 100px;
    background-color: blue;
    position: absolute;
    top: 500px;
    left: 50px;
    transition: top 200ms ease-out;
}

#enemy {
    width: 100px;
    height: 100px;
    background-color: red; 
    position: absolute; 
    top: 500px;
    right: 100px;
}

body {
    background-color: black;
}