设置带有橙色轮廓的Bootstrap 4按钮的警告操作
使用btn-outline-warning类为Bootstrap4按钮设置橙色轮廓，并指示警告操作。
以下包括按钮上的橙色轮廓-
<button type="button" class="btn btn-outline-warning"> Rejected </button>
该类的添加与添加到Bootstrap中任何元素的任何其他类一样。对于Bootstrap按钮，我使用了<button>元素。
您可以尝试运行以下代码来实现btn-outline-warning类-
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>
<h3>College Placements</h3>
<ul class = "list-group">
<li class = "list-group-item">Selected Students</li>
<li class = "list-group-item">Rejected Students</li>
<li class = "list-group-item">Result Awaited</li>
</ul>
<p>List of selected and rejected students:</p>
<button type="button" class="btn btn-outline-success">Selected</button>
<button type="button" class="btn btn-outline-warning">Rejected</button>
</body>
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