Html
<html>
<!-- heading -->
<head>
<meta charset="utf-8">
<title>Example</title>
<style>
.show-border
{
border:1px solid #555;
height:64px;
margin-bottom:20px;
background-color:white;
}
</style>
</head>
<!-- page -->
<body style='background-color:#DADADA'>
<!-- connect library jQuery -->
<script src="https://dir.by/example_lib/jquery/jquery-3.3.1.min.js"></script>
<!-- connect library Bootstrap (js file) -->
<script src="https://dir.by/example_lib/bootstrap-4.1.3/js/bootstrap.min.js"></script>
<!-- connect library Bootstrap (css file) -->
<link rel="stylesheet" href="https://dir.by/example_lib/bootstrap-4.1.3/css/bootstrap.min.css">
<!-- HTML Elements -->
<div class="container">
1st row
<div class="row">
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
<div class="col-md-1 show-border"> 1cell </div>
</div>
2nd row
<div class="row">
<div class="col-md-2 show-border"> 2 Cells</div>
<div class="col-md-10 show-border"> 10 Cells</div>
</div>
3rd row
<div class="row">
<div class="col-md-3 show-border"> 3 Cells</div>
<div class="col-md-9 show-border"> 9 Cells</div>
</div>
4th row
<div class="row">
<div class="col-md-4 show-border"> 4 Cells</div>
<div class="col-md-8 show-border"> 8 Cells</div>
</div>
5th row
<div class="row">
<div class="col-md-5 show-border"> 5 Cells</div>
<div class="col-md-7 show-border"> 8 Cells</div>
</div>
6th row
<div class="row">
<div class="col-md-6 show-border"> 6 Cells</div>
<div class="col-md-6 show-border"> 6 Cells</div>
</div>
7th row
<div class="row">
<div class="col-md-4 show-border"> 4 Cells</div>
<div class="col-md-4 show-border"> 4 Cells</div>
<div class="col-md-4 show-border"> 4 Cells</div>
</div>
8th row
<div class="row">
<div class="col-md-12 show-border"> 12 Cells</div>
</div>
</div>
</body>
</html>
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