使用Bootstrap创建一个绿色按钮（成功）
使用Bootstrap中的.btn-success类创建一个绿色按钮，指示成功
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link rel = "stylesheet"
href = "https://maxcdn.bootstrapcdn.com/bootstrap/4.1.1/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/4.1.1/js/bootstrap.min.js"></script>
</head>
<body>
<p>Click below if you want to know the result of successful students:</p>
<button type = "button" class = "btn btn-success">Submit</button>
</body>
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