Set a dark border to an element in Bootstrap

If you want to set a dark border to an element, use the border-dark class.

Spot the difference between a normal border and dark border −

To add a dark border, you need to simply add it like any other class in div as shown below −

<div class="myclass border border-dark">
  Dark Border

Above, the test is the CSS style, I have used to style my rectangle (div) −

.myclass {
  width: 150px;
  height: 150px;
  margin: 35px;

Let us see how to work with the border-dark class in Bootstrap 4 −


Live Demo

<!DOCTYPE html>
    <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>
      .myclass {
         width: 150px;
         height: 150px;
         margin: 35px;

<div class="container">
  <p>Rectangles with normal and dark border:</p>
  <div class="myclass border">Normal Border</div>
  <div class="myclass border border-dark">Dark Border</div>

Updated on: 15-Jun-2020


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