Bootstrap 4卡-在底部对齐内容

Question

我将一组自举程序卡放在一个卡组中，这意味着它们的宽度和高度都相同。每张卡的内容高度不同，我需要在每张卡的底部对齐一个按钮（不是卡的页脚，我在那里还有其他内容）。我尝试在每张卡中添加“人造”空白，以便它们都匹配，但是在调整窗口大小时会中断。有任何想法吗？这是相关的代码。

<div class="card-group">
    <div class="card">
        <div class="card-header">
            Header
        </div>
        <div class="card-body">
            <div>
                Line 1
            </div>
            <div>
                Line 2
            </div>
            <div>
                Line 3
            </div>
            <div>
                <input type="button" class="btn btn-primary" value="Need this button aligned at bottom of card" />
            </div>
        </div>
        <div class="card-footer">
            Footer
        </div>
    </div>
    <div class="card">
        <div class="card-header">
            Header
        </div>
        <div class="card-body">
            <div>
                Line 1
            </div>
            <div>
                Line 2
            </div>
            <div>
                <input type="button" class="btn btn-primary" value="Need this button aligned at bottom of card" />
            </div>
        </div>
        <div class="card-footer">
            Footer
        </div>
    </div>
    <div class="card">
        <div class="card-header">
            Header
        </div>
        <div class="card-body">
            <div>
                Line 1
            </div>
            <div>
                Line 2
            </div>
            <div>
                Line 3
            </div>
            <div>
                Line 4
            </div>
            <div>
                <input type="button" class="btn btn-primary" value="Need this button aligned at bottom of card" />
            </div>
        </div>
        <div class="card-footer">
            Footer
        </div>
    </div>
</div>

谢谢！

Answer 1

使用flexbox utils和/或auto margin。例如，您可以使.card-body display:flex（d-flex flex-column）和margin-top:auto（mt-auto）向下按下按钮...

https://www.codeply.com/go/mfrRHlgydc

<div class="card-group">
        <div class="card">
            <div class="card-header">
                Header
            </div>
            <div class="card-body d-flex flex-column">
                <div>
                    Line 1
                </div>
                <div>
                    Line 2
                </div>
                <div class="mt-auto">
                    <input type="button" class="btn btn-primary" value="Need this button aligned at bottom of card" />
                </div>
            </div>
            <div class="card-footer">
                 ...
            </div>
        </div>
        <div class="card">
            <div class="card-header">
                Header
            </div>
            <div class="card-body d-flex flex-column">
                <div>
                    Line 1
                </div>
                <div>
                    Line 2
                </div>
                <div>
                    Line 3
                </div>
                <div class="mt-auto">
                    <input type="button" class="btn btn-primary" value="Need this button aligned at bottom of card" />
                </div>
            </div>
            <div class="card-footer">
                ..
            </div>
        </div>
    </div>

相关问题：
Bootstrap-卡底部的对齐按钮
使用Flexbox对齐Bootstrap 4 .card中的项目