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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
​
  <div class="container">
        <div class="kw" id="quadrat"></div>
    </div>  
  
  
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
</body>
</html>
 
.container {
    position: relative;
    border: 1px solid #000000;
    width: 800px;
    height: 400px;
}
.kw {
    position: absolute;
    width: 10px;
    height: 10px;
    top: 0;
    left: 0;
    background-color: #ff0000;
}
 
$(document).ready(function(){
    go_kwadrat();
});
​
function go_kwadrat(){
    move_me();
}
​
​
function move_me(){
    $(document).on('keydown', function(event){
​
        let klawisz = event.which;
        let kwadrat = $('#quadrat');
​
   if(klawisz === 37 && kwadrat.style.left > 0){
      console.log('lewo');
      kwadrat.style.left -= 1
   }else if(klawisz === 38 && kwadrat.style.top > 0){
      console.log('góra');
      kwadrat.style.top -= 1
   }else if(klawisz === 39 && kwadrat.style.left < 790){
      console.log('prawo');
      kwadrat.style.left += 1
   }else if(klawisz === 40 && kwadrat.style.top < 390){
      console.log('dół');
      kwadrat.style.top += 1
      }
   });
}
Output 300px

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