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">

Let us see an example to set a blue border −


Live Demo

<!DOCTYPE html>
<html lang="en">
    <title>Bootstrap Example</title>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="">
    <script src=""></script>
    <script src=""></script>
    .demo {
      width: 350px;
      height: 170px;
      margin: 10px;
    <div class="container">
      <h2>Demo Heading</h2>
      <div class="demo border border-primary">This rectangle has blue border</div>

Updated on: 17-Jun-2020


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