Я только начал изучать Bootstrap.Сейчас я пытаюсь воспроизвести старый дизайн, который я создал с использованием таблиц.Ниже дизайна, который я хочу получить
![Looks I want](https://i.stack.imgur.com/byoTu.png)
Но, к сожалению, мое умение Bootstrap убивает меня при этом
![I hate this](https://i.stack.imgur.com/eEJS6.png)
Строки D [D1, D2] не выровнены , что я хочу.Ниже код, который я использовал [взят из примеров Bootstrap]
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="">
<meta name="author" content="Mark Otto, Jacob Thornton, and Bootstrap contributors">
<meta name="generator" content="Jekyll v3.8.5">
<title>Jumbotron Template ยท Bootstrap</title>
<!-- Bootstrap core CSS -->
<link href="https://getbootstrap.com/docs/4.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
<style>
.bd-placeholder-img {
font-size: 1.125rem;
text-anchor: middle;
}
@media (min-width: 768px) {
.bd-placeholder-img-lg {
font-size: 3.5rem;
}
}
</style>
<!-- Custom styles for this template -->
<link href="https://getbootstrap.com/docs/4.2/examples/jumbotron/jumbotron.css" rel="stylesheet">
<link href="https://getbootstrap.com/docs/4.0/examples/sticky-footer-navbar/sticky-footer-navbar.css" rel="stylesheet">
</head>
<body>
<nav class="navbar navbar-expand-md navbar-dark fixed-top bg-dark">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu" aria-labelledby="dropdown01">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<!-- Example single danger button -->
<div class="btn-group">
<button type="button" class="btn btn-danger dropdown-toggle" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Action
</button>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<a class="dropdown-item" href="#">Something else here</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Separated link</a>
</div>
</div>
</li>
</ul>
<div class="alert alert-success">
<strong>A</strong>
</div>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<main role="main">
<!-- Main jumbotron for a primary marketing message or call to action -->
<div class="jumbotron">
<div class="container">
<h1 class="display-3">B</h1>
<p>This is a template </p>
<p><a class="btn btn-primary btn-lg" href="#" role="button">Learn more »</a></p>
</div>
</div>
<div class="row mb-2">
<div class="col-md-4"> <div class="alert alert-success"> C</div>
</div>
<div class="col-md-8">
<div class="alert alert-warning"> D1</div>
</div>
<div class="col-md-8">
<div class="alert alert-warning"> D2</div>
</div>
</div>
</main>
<footer class="footer">
<div class="container">
<span class="text-muted">E</span>
</div>
</footer>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script>window.jQuery || document.write('<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"><\/script>')</script><script src="https://getbootstrap.com/docs/4.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-zDnhMsjVZfS3hiP7oCBRmfjkQC4fzxVxFhBx8Hkz2aZX8gEvA/jsP3eXRCvzTofP" crossorigin="anonymous"></script></body>
</html>