Bootstrap

Downloaded and extract file

Go to http://getbootstrap.com/

You'll see something like this:

<!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">
    <title>Bootstrap</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

 
  </head>
  <body>
   
    <h1>Hello, world!</h1>

   
  </body>
</html>

open index.html with sublime


 <div class="jumbotron">
   <h1>My name is Sachin</h1>
   <p>I play cricket</p>
   <a class="btn btn-primary btn-lg">Click this!</a>
 </div>

Bootstrap-ify

Keep this inside your body tag

Result

What really happened ???

Go to http://getbootstrap.com/