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Selected Reading
Set a blue border to an element in Bootstrap
Use the border-primary class to set a blue border to an element.
For a blue border, add the class, as if you add it for <div> or any other element −
<div class="demo border border-primary"> </div>
Let us see an example to set a blue border −
Example
<!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://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<style>
.demo {
width: 350px;
height: 170px;
margin: 10px;
}
</style>
</head>
<body>
<div class="container">
<h2>Demo Heading</h2>
<div class="demo border border-primary">This rectangle has blue border</div>
</div>
</body>
</html> 
Updated on: 2020-06-17T14:48:55+05:30
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