CSS class align-self-end not working

问题

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" />
<div class="col-md-3">
  <div class="card bg-dark text-white">
    <img class="card-img" src="http://via.placeholder.com/300x340" alt="Card image">
    <div class="card-img-overlay">
      <h5 class="card-title">Title</h5>
      <h3 class="card-text font-weight-bold"><span class="mr-auto">Some other title here</span></h3>
      <div class="align-self-end">Text I want at bottom</div>
    </div>
  </div>
</div>

I am unable to get the text in the last div by applying this class align-self-end to the bottom of the image. I understand that flex has been applied to the .card-img-overlay div with the direction of column then why am I unable to get the div to the bottom of the image?

回答1:

The card-img-overlay div isn't display:flex.

You can do this by adding the d-flex flex-column classes to it, and use mt-auto to push the text to the bottom.

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

<div class="card bg-dark text-white">
       <img class="card-img" src="http://via.placeholder.com/300x340" alt="Card image">
       <div class="card-img-overlay d-flex flex-column">
            <h5 class="card-title">Title</h5>
            <h3 class="card-text font-weight-bold"><span class="mr-auto">Some other title here</span></h3>
            <div class="mt-auto">Text I want at bottom</div>
       </div>
</div>

来源：https://stackoverflow.com/questions/48719567/css-class-align-self-end-not-working