Bootstrap Border Utilities Tutorial

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1- Border Utility

Border Utility means part of  Bootstrap. It provides classes to help users to set up  border for elements.
Lớp Description
.border Set up border for 4 sides of element.
.border-left Set up border for the left side of element.
.border-right Set up border for the right side of element.
.border-top Set up border for the top side of element.
.border-bottom Set up border for the  bottom side of element.
.border-left-0 Set up border for all sides, except for left side.
.border-right-0 Set up border for all sides, except for right side.
.border-top-0 Set up border for all sides, except for top side.
.border-bottom-0 Set up border for all sides, except for bottom side.


border-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Border Example</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
      <style>
         .container div {
         margin: 10px;
         padding :10px;
         background: #fbfcfc;
         }
      </style>
   </head>
   <body>

      <div class="container">
         <div class="border ">
            .border
         </div>
         <div class="border-left ">
            .border-left
         </div>
         <div class="border-right ">
            .border-right
         </div>
         <div class="border-top ">
            .border-top
         </div>
         <div class="border-bottom ">
            .border-bottom
         </div>
      </div>

      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

2- Border color 

There are a few classes to set up color for   border built-in by the  Bootstrap. You can use it in a suitable context:
  • .border-primary
  • .border-secondary
  • .border-success
  • .border-danger
  • .border-warning
  • .border-info
  • .border-light
  • .border-dark
  • .border-muted
  • .border-white
border-color-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Border Example</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
      <style>
         .container div {
         margin: 10px;
         padding :10px;
         background: #ebf5fb;
         }
      </style>
   </head>
   <body>
      <div class="container">
         <div class="border border-primary">
            .border .border-primary
         </div>
         <div class="border-left border-danger">
            .border-left .border-danger
         </div>
         <div class="border-right border-danger">
            .border-right .border-danger
         </div>
         <div class="border-top border-success">
            .border-top .border-success
         </div>
         <div class="border-bottom border-info">
            .border-bottom .border-info
         </div>
      </div>

      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

3- Border width 

Bootstrap doesn't define any class to set up the width of  border. But, you can self-definite such classes, for example,  .border-* (* = 1, 2, 3, ...).
.border-5 {
     border-width:5px !important;
}

 .border-2 {
     border-width:2px !important;
}
border-width-example.html
<!DOCTYPE html>
<html>
   <head>
      <meta charset="utf-8">
      <title>Border Example</title>
      <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css">
      <style>
         .container div {
         margin: 10px;
         padding :10px;
         background: #fbfcfc;
         }
         .border-5 {
         border-width:5px !important;
         }
         .border-2 {
         border-width:2px !important;
         }
      </style>
   </head>
   <body>
      <div class="container">
         <div class="border border-2">
            .border .border-2
         </div>
         <div class="border-left border-5">
            .border-left .border-5
         </div>
         <div class="border-right border-2">
            .border-right .border-2
         </div>
         <div class="border-top border-5">
            .border-top .border-5
         </div>
         <div class="border-bottom border-5">
            .border-bottom .border-5
         </div>
      </div>

      <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
      <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js"></script>
      <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
   </body>
</html>

4- Border-Radius

Some additional classes help you to round element angles.
  • .rounded
  • .rounded-left
  • .rounded-right
  • .rounded-top
  • .rounded-bottom
  • .rounded-0
round-example
<div class="container">
   <div class="border rounded">
      .border .rounded
   </div>
   <div class="border rounded-left">
      .border-left .rounded-left
   </div>
   <div class="border rounded-right">
      .border .rounded-right
   </div>
   <div class="border rounded-top">
      .border .rounded-top
   </div>
   <div class="border rounded-bottom">
      .border .rounded-bottom
   </div>
   <div class="border rounded-circle">
      .border-bottom .rounded-circle
   </div>
   <div class="border rounded-0">
      .border-bottom .rounded-0
   </div>
</div>

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