How to specify border colors in Bootstrap ?

Last Updated : 29 Dec, 2021

Bootstrap provides us with different classes that can be used with different HTML tags such as <button>, <a>, <input>, and <label> to apply custom button borders.These classes are as follows.

border
border-top
border-bottom
border-left
border-right

In this article, we will learn to implement border colors using Bootstrap.

CDN link: First, add Bootstrap scripts needed for your project.

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/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/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>

Example 1: The following code shows a simple use of border classes.

HTML

<!DOCTYPE html>
<html>
<head>
    
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" 
          href=        
"https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" 
          integrity=
"sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" 
          crossorigin="anonymous">
    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
    <script src=
"https://code.jquery.com/jquery-3.3.1.slim.min.js" 
            integrity=
"sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" 
            crossorigin="anonymous">
    </script>
    <script src=
"https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.6/umd/popper.min.js" 
            integrity=
"sha384-wHAiFfRlMFy6i5SRaxvfOCifBUQy1xHdJ/yoi7FRNXMRBu5WHdZYu1hA6ZOblgut" 
            crossorigin="anonymous">
    </script>
    <script src=
"https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/js/bootstrap.min.js" 
            integrity=
"sha384-B0UglyR+jN6CkvvICOB2joaf5I4l3gm9GU6Hc1og6Ls7i6U/mkkaduKaBhlAXv9k" 
            crossorigin="anonymous">
    </script>
    <!-- Custom CSS -->
    <style>
            h2{
                color: green;
                text-align: center;
            }
            div.one{
                margin-top: 40px;
                text-align: center;
            }
            button{
                margin-top: 10px;
                width:80px;
                height:80px;
                margin-right:15px;
                border:white;
            }
    </style>
</head>
<body>
    <h2>GeeksforGeeks</h2>
    <div class="container">
        <!-- Bootstrap Button Classes -->    
        <div class="one">
            <button class="border"></button>
            <button class="border-top"></button>
            <button class="border-bottom"></button>
            <button class="border-left"></button>
            <button class="border-right"></button>       
        </div>    
    </div>    
</body>
</html>

Output:

Note: As you can see the output is barely visible. For this purpose, Bootstrap provides border colors.

Bootstrap border colors: It also provides a series of classes that can be used on the above bootstrap border classes to apply custom border styles. These classes are as follows:

border-primary
border-secondary
border-success
border-danger
border-warning
border-info
border-light
border-dark
border-white

Note: In order for the above classes to work, Bootstrap border classes should also be mentioned along with the above classes. The below examples use the Bootstrap "border" class.

Example 2: The following example demonstrates classes "border-primary", "border-secondary", "border-success","border-danger","border-warning" with blue,gray,green,red and yellow colors respecively.

HTML

<!DOCTYPE html>
<html lang="en">
    
<head>    
    <meta charset="utf-8">
    <meta name="viewport" 
          content="width=device-width, initial-scale=1">

    <link rel="stylesheet"
          href=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/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/1.14.7/umd/popper.min.js">
    </script>    
    <script src=
"https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js">
    </script>
</head>

<body>
    <div class="container">
        <ul>
            <li class="border border-primary">
                .border border-primary
            </li>
            <br>
              <li class="border border-secondary">
                .border border-secondary
            </li>
            <br>
              <li class="border border-success">
                .border border-success
            </li>
            <br>
              <li class="border border-danger">
                .border border-danger
            </li>
            <br>    
              <li class="border border-warning">
                .border border-warning
            </li>
      </ul>
    </div>
</body>

Output:

Example 3: The following example demonstrates classes "border-info","border-light","border-dark","border-white" with cyan,light,black and white colour respectively.