upvote.html

<html>

<head>
  <meta charset="UTF-8">
  <title></title>
  <style>
     
.main {
  margin: 100px auto;
  text-align: center;
}

button {
  padding: 20px;
  background: transparent;
  text-shadow: 1px 1px 1px #202020;
  font-size: 18pt;
  border: 1px solid lightblue;
  color: lightblue;
}

  </style>
</head>

<body>
  <div class="main">
    <button id="clickme">Click me: 0</button>
  </div>
  <script>
      var button = document.getElementById("clickme"),
  count = 0;
button.onclick = function() {
  count += 1;
  button.innerHTML = "Click me: " + count;
};

  </script>
  <div class="main">
      <button id="clickme">Click me: 0</button>
    </div>
  <script>
      var button = document.getElementById("clickme"),
  count = 0;
button.onclick = function() {
  count += 1;
  button.innerHTML = "Click me: " + count;
};

  </script>
</body>

</html>