SOURCE

$(function(){
$(window).keypress((key)=>{
let keyCode=key.which
let top=$('#ball').css('top')
let left=$('#ball').css('left')
switch(keyCode){
case 119:
$('#ball').css('top',parseInt(top)-10)
break
case 115:
$('#ball').css('top',parseInt(top)+10)
break
case 97:
$('#ball').css('left',parseInt(top)-10)
break
case 119:
$('#ball').css('left',parseInt(top)+10)
break
}
})
$('#ball').mouseover(()=>{
let top=$('#ball').css('top')
let left=$('#ball').css('left')
$('#ball').css('left',parseInt(left)-20).css('top',parseInt(top)+10)
})
})

<script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<div id="main">
    <div id="ball"></div>
</div>

*{
margin: 0;
padding: 0;

}
#main{
height: 500px;
width: 500px;
border: 2px solid blue;

}
#ball{
height: 50px;
width: 50px;
background-color: red;
border-radius: 50%;
position: relative;
top: 50%;
left: 50%;
}