You can try this:
<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags always come first -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <!-- For Responsive Screens -->
<meta http-equiv="x-ua-compatible" content="ie=edge">
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
</head>
<body>
<!--The Grid Starts Here-->
<div class="row" style="height: 500px;">
<div class="col-7">
<div class="row" style="height: 350px; background-color: blue;">
<div class="col-4" style="background-color: white;">
<div class="row" style="background-color: orange; height: 100px;">
</div>
<div class="row" style="background-color: blue; height: 250px;">
</div>
</div>
<div class="col-8" style="background-color: yellow;">
</div>
</div>
<div class="row" style="height: 150px; background-color: black;">
<div class="col-6" style="background-color: lightgrey;">
</div>
<div class="col-6" style="background-color: red;">
</div>
</div>
</div>
<div class="col-5" style="background-color: green;"></div>
</div>
<!--The Grid Ends Here-->
<!-- jQuery first, then Popper.js, then Bootstrap JS. -->
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>
与恶龙缠斗过久,自身亦成为恶龙；凝视深渊过久,深渊将回以凝视…
