卡未在引导程序 4 中居中 [重复]

Posted 2023-03-05

【中文标题】卡未在引导程序 4 中居中 [重复]

【英文标题】：Card not being centred in bootstrap 4 [duplicate]

【发布时间】：2021-07-22 13:04:00

【问题描述】：

所以我试图让一组卡片居中，但我无法做到。这些卡片在一个容器中，即使使用 justify 内容中心，我也无法将它们居中。有什么解决办法吗？我的代码示例如下：

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<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>
<div class="container justify-content-center text-center">
    <div class="justify-content-center text-center">
        <div class="row">
            <div class="col-sm-6 col-md-6 col-lg-3 col-xl-3 mx-lg-3 mt-4">
                    <div class="card text-center mx-auto" style="width: 18rem;">
                        <div class="embed-responsive embed-responsive-16by9">
                            <img  class="card-img-top embed-responsive-item" src="https://source.unsplash.com/random/800x600" />
                        </div>
                            <div class="card-body">
                            <h5 class="card-title">Card title</h5>
                            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
                            <a href="#" class="btn btn-primary">Add to cart</a>
                        </div>
                    </div>
            </div>
        </div>
    </div>
</div>

这是一张显示它没有居中的图像。

【问题讨论】：

将justify-content-center 类放在row 元素上，而不是其父元素上。现在，您将行“居中”，该行始终是 full 宽度。

【参考方案1】：

您必须将“justify-content-center”类添加到包含“row”类的元素中。

例如。

<div class="row justify-content-center">...</div>

sn-p

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<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>
<div class="container justify-content-center text-center">
    <div class="justify-content-center text-center">
        <div class="row justify-content-center">
            <div class="col-sm-6 col-md-6 col-lg-3 col-xl-3 mx-lg-3 mt-4">
                    <div class="card text-center mx-auto" style="width: 18rem;">
                        <div class="embed-responsive embed-responsive-16by9">
                            <img  class="card-img-top embed-responsive-item" src="https://source.unsplash.com/random/800x600" />
                        </div>
                            <div class="card-body">
                            <h5 class="card-title">Card title</h5>
                            <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
                            <a href="#" class="btn btn-primary">Add to cart</a>
                        </div>
                    </div>
            </div>
        </div>
    </div>
</div>