Bootstrap 4 - 对齐

Bootstrap 4 - Alignment

我无法水平和垂直对齐以下内容。

有人能告诉我最好的方法吗?

<div class="container">
                    <div class="row">
                        <div class="col-sm-8">
                            <div class="flip-card text-center top-to-bottom">
                                ...
                                ...
                            </div>
                        </div>
                        <div class="col-sm-4">
                            <div class="flip-card text-center">
                                ...
                                ...
                            </div>
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-sm-4">
                            <div class="flip-card text-center">
                                ...
                                ...
                            </div>
                        </div>
                        <div class="col-sm-4">
                            <div class="flip-card text-center">
                                ...
                                ...
                            </div>
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-sm-4">
                            <div class="flip-card text-center">
                                ...
                                ...
                            </div>
                        </div>
                        <div class="col-sm-8">
                            <div class="flip-card text-center top-to-bottom">
                                ...
                                ...
                            </div>
                        </div>
                    </div>
                </div>

网站浏览量enter image description here

我想要这样enter image description here

谢谢

 <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet"/>


<div class="row">
    
    <div class="col-md-8">
        <div class="row">
            <div class="col-md-12">
                <div class="well">1</div>
            </div>
        </div>
        <div class="row">
            <div class="col-md-6">
                <div class="well">2</div>
            </div>
            <div class="col-md-6">
                <div class="well">3</div>
            </div>
        </div>
    </div>
    <div class="col-md-4">
        <div class="well">4
            <br/>
            <br/>
            <br/>
            <br/>
            <br/>
        </div>
    </div>
</div>
<div class="row">
    <div class="col-md-4">
        <div class="well">5</div>
    </div>
    <div class="col-md-8">
        <div class="well">6</div>
    </div>
</div>

您应该只需要 2 行。没有完整的 HTML 很难准确,但您应该将前两行合并为一个 column break,以便 2 张图片移动到新行。从那里你只需要调整你的填充和边距。