<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Tiêu đề</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" type="text/css" href="css/bootstrap.min.css">
<style type="text/css">
/*Css tùy chỉnh*/
body{
background-color: #ccc;
}
.container{
background-color: #fff; max-width: 1000px;
}
.k1{ min-height: 100px; background: yellow; }
.k2{ min-height: 30px; background: green; }
.k3{ min-height: 300px; background: cyan; }
.k4{ min-height: 300px; background: #fff; }
.k5{ min-height: 300px; background: blue; }
.k6{ min-height: 100px; background: #eee; }
</style>
</head>
<body>
<div class="container">
<div class="row">
<div class="k1 col-12">
<div class="row">
K1
</div>
</div>
<div class="k2 col-12">
<div class="row">
K2
</div>
</div>
<div class="k3 col-12 col-sm-3 col-md-2">
<div class="row">
K3
</div>
</div>
<div class="k4 col-12 col-sm-9 col-md-8">
<div class="row">
K4
</div>
</div>
<div class="k5 col-12 col-sm-12 col-md-2">
<div class="row">
K5
</div>
</div>
<div class="k6 col-12">
<div class="row">
K6
</div>
</div>
</div>
</div>
<script src="js/bootstrap.min.js"></script>
</body>
</html>