使用.justify-content-*-end类在不同的屏幕尺寸上最终对齐弹性项目，如下所示：
对于小尺寸的屏幕，请使用-
justify-content-sm-end
对于中等大小的屏幕，请使用-
justify-content-md-end
对于大屏幕，使用-
justify-content-lg-end
让我们看看如何在小，中和大屏幕尺寸上水平对齐弹性项目-
<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/3.3.1/jquery.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script> </head> <body> <div class="container mt-3"> <h3>Form of Tea</h3> <div class="d-flex justify-content-sm-end bg-secondary mb-5"> <div class="p-2 bg-warning">Black Tea</div> <div class="p-2 bg-info">Green Tea</div> <div class="p-2 bg-secondary">Indian Tea</div> </div> <div class="d-flex justify-content-md-end bg-secondary mb-5"> <div class="p-2 bg-info">Black Tea</div> <div class="p-2 bg-danger">Green Tea</div> <div class="p-2 bg-secondary">Indian Tea</div> </div> <div class="d-flex justify-content-lg-end bg-secondary mb-5"> <div class="p-2 bg-primary">Black Tea</div> <div class="p-2 bg-warning">Green Tea</div> <div class="p-2 bg-danger">Indian Tea</div> </div> </div> </body> </html>