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Answer» To add OUTLINE to Buttons, Bootstrap 4 came up with some classes for outline buttons. For example, For a blue outline, use the .btn-outline-primary class. In the same way for red outline, use the .btn-outline-danger class.
The following is an example: <!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Buttons Outline</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<LINK rel="STYLESHEET" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
<script SRC="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Buttons</h2>
<button type="button" class="btn btn-outline-primary">Primary</button>
<button type="button" class="btn btn-outline-secondary">Secondary</button>
<button type="button" class="btn btn-outline-info">Info</button>
<button type="button" class="btn btn-outline-success">Success</button>
<button type="button" class="btn btn-outline-warning">Warning</button>
<button type="button" class="btn btn-outline-danger">Danger</button>
<button type="button" class="btn btn-outline-DARK">Dark</button>
</div>
</body>
</html>The output displays outline for Buttons:
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