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

  </head>
  <body>

	<div class="container">

	  <div class="row">

	  <div class="col-md-3">
	     <div class="col1">side left</div>
	  </div>
	  <div class="col-md-6">
	     <div class="col2">main col</div>
	  </div>
	  <div class="col-md-3">
	     <div class="col3">side right</div>
	  </div>

	  <!--
	  <div class="col-md-2">
	     <div class="col4">col 4</div>
	  </div>
	  <div class="col-md-2">
	     <div class="col5">col 5</div>
	  </div>
	  <div class="col-md-2">
	     <div class="col6">col 6</div>
	  </div>
	  -->

	  </div>

	</div>

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