JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
<style>
body {margin:0;}

.navbar {
  overflow: hidden;
  background-color: #333;
  position: fixed;
  top: 100;
  width: 100%;
}

.navbar a {
  float: left;
  display: block;
  color: #f2f2f2;
  text-align: center;
  padding: 14px 16px;
  text-decoration: none;
  font-size: 17px;
}

.navbar a:hover {
  background: #ddd;
  color: black;
}

.main {
  height: 2500px; /* Used in this example to enable scrolling */
}

.button {
  position: absolute;
  top: 1000px;
}

</style>
</head>
<body>
<div class=button>
	<button id="btn1" onclick="Click('Button1')"> button1</button>
	</div>
<div class=main>
	<div class="navbar">
	  <a id="menu1" onclick="Click('Menu1')">Menu1</a>
	  </div>
</div>
<button id="btn2" onclick="Click('Button2')"> button2</button>
</body>
<script>
function Click(btn) {
    alert("I Clicked on " + btn);
}
</script>

</html>