Bootstrap 4 Button .btn-outline-primary类
Bootstrap4使用btn-outline-primary类设置蓝色轮廓按钮。
使用btn-outline-primary类向按钮添加蓝色轮廓，如以下代码片段所示-
<button type="button" class="btn btn-outline-primary"> Result </button>
您可以尝试运行以下代码以实现btn-outline-primary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>
<div class="container">
<h4>Result</h4>
<p>Click below to get the result:</p>
<button type="button" class="btn btn-outline-primary">Result</button>
</div>
</body>
</html>