Untitled

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Malowanie pokoju</title>
    <link rel="stylesheet" href="style.css">
  </head>
  <body>
    <script src="script.js"></script>
    <h1>Malowanie pokoju</h1>
    <p>
      <center>
      Wysokosc:  <input id="wys" type="number"><br>
      Szerokosc: <input id="sz" type="number"><br>
      M2: <input id="m2" value='0' type="text" name="lname" disabled><br>
        Koszt: <input id="kszt" value='0 zł' type="text" name="lname" disabled><br>
        <button onclick="calc()">oblicz</button>
      </center>
    </p>
  </body>
</html>