Untitled

<!DOCTYPE html>
<html>

  <head>
    <link rel="stylesheet" href="style.css">
  </head>

  <body>
       

    <table>
      <tr>
        <td id="sie" style="background-color: #f3f5f7;">&nbsp;sie</td>
      </tr>
    </table>
  
    <img id="sein_img" src="http://placehold.it/50x50/00adef/fff?text=abc">
    
    <script src="script.js"></script>
  </body>

</html>

// Code goes here


(function() {
  console.log(document.querySelector("img"));
  document.querySelector("#sein_img").addEventListener('mouseover', function() {
    document.getElementById("sie").style.backgroundColor = "red";
  });
})();

/* Styles go here */