index.htm

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>javascript tutorial</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .container{
            border: 2px solid red;
            margin: 3px 0 ;
            background: cyan;
            padding: 9px;
        }
        .bg-primary{
            background-color: blueviolet;
        }
    </style>
  </head>
  <body>
    <h1>welcome to my javascript tutorial</h1>
    <div class="container">
      <button id="click">click me</button>
    </div>
    <div class="container">
      <p>this is paragraph</p>
    </div>
    <script src="index.js"></script>
  </body>
</html>