index.html

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="style.css">
<title>RAMMAT FORM</title>
</head>
<body>

<div class="dropdown">
  <button onclick="myFunction()" class="dropbtn">SELECT GAME</button>
  <div id="myDropdown" class="dropdown-content">
    <a href="kabbadi.html">KABBADI</a>
    <a href="sitolia.html">SITOLIA</a>
  </div>
</div>

<script>
function myFunction() {
  document.getElementById("myDropdown").classList.toggle("show");
}

window.onclick = function(event) {
  if (!event.target.matches('.dropbtn')) {
    var dropdowns = document.getElementsByClassName("dropdown-content");
    var i;
    for (i = 0; i < dropdowns.length; i++) {
      var openDropdown = dropdowns[i];
      if (openDropdown.classList.contains('show')) {
        openDropdown.classList.remove('show');
      }
    }
  }
}
</script>

</body>
</html>