使用Bootstrap 4在特定屏幕尺寸上创建Flexbox容器
使用Bootstrap中的.d-*-flex类，在特定的屏幕尺寸上创建一个flexbox容器。
对于不同的屏幕尺寸，将其用作“d-sm-flex”，“d-md-flex”等，如下所示-
<span class="d-sm-flex bg-warning"> Small Screen </span> <span class="d-md-flex bg-info"> Medium Screen </span> <span class="d-lg-flex bg-success"> Large Screen </span> <span class="d-xl-flex bg-danger"> Extra Large Screen </span>
在上方，弹性项目设置为小，中，大和超大屏幕尺寸。
让我们看一看该类及其实现的示例-
示例
<!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">
<h2>Flex Example</h2>
<div class="d-flex bg-primary">d-flex</div>
<span class="d-sm-flex bg-warning">d-sm-flex</span>
<span class="d-md-flex bg-info">d-md-flex</span>
<span class="d-lg-flex bg-success">d-lg-flex</span>
<span class="d-xl-flex bg-danger">d-xl-flex</span>
</div>
</body>
</html>