-请帮助我解决这个问题。
<div id="nl-container-1" class="nl-container">
<div class="nl-row">
<div class="card" style="width: 18rem;">
<img src="img/250x180.png" class="card-img-top" alt="...">
<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">Go somewhere</a>
</div>
</div>
</div>
<div class="nl-row">
<div class="card" style="width: 18rem;">
<img src="img/250x180.png" class="card-img-top" alt="...">
<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">Go somewhere</a>
</div>
</div>
</div>
<div class="nl-row">
<div class="card" style="width: 18rem;">
<img src="img/250x180.png" class="card-img-top" alt="...">
<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">Go somewhere</a>
</div>
</div>
</div>
</div>
答案 0 :(得分:0)
供家长使用(display:flex; justify-content:center),供孩子使用:width 300px)