helloworld.html

<!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">
    <!-- The above 3 meta tags *must* come first in the head;
         any other head content must come *after* these tags -->
    <title>Bootstrap 101 Template</title>

    <!-- Bootstrap's CSS -->
    <link href="css/bootstrap.min.css" rel="stylesheet">
  </head>
  <body>
    <!-- All of your HTML will go between here.... -->
    <h1>Hello, world!</h1>

    <!-- ...and here. -->
    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="js/jquery.min.js"></script>
    <!-- Include all compiled plugins (below),
         or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
  </body>
</html>