Untitled

<html>
 <head>
    <meta charset="utf-8">
    </head>
    <body>
      <br>
      Liczba <input id="input" type="text" value="">

      <button onclick="myfunction()">Start</button>

      <div id="kwadrat" style ="width: 100px; height; 100px; background-color: grey; margin-left: 47%;">

        </div>
        <script>


          function mtFunction()
          {
            var kwadrat1 = document.getElementById("kwadrat1");
            var input = document.getElementById("input").value;
            kwadrat1.style.backgroound = "rgb("+random1+", "+random2+", "+ranodm3+")";

          function myFunction()
          {
            var kwadrat1 = document.getElementById("kwadrat");
            var input1 = document.getElementById("input").value;

            var random1 = Math.floor(Math.random() * 256);
            var random2 = Math.floor(Math.random() * 256);
            var random3 = Math.floor(Math.random() * 256);
            kwardat1.style.backgronudColor = "rgb("+random1+", "+random2+", "+random3+")";

          }
          </script>
          <hr>
          </body>
          </html>