Bootstrap 4 Well

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Bootstrap provides the following classes to add a rounded border around an element with a gray background color and some padding.

.well: Add a normal size well.
.well-sm: Add a small size well.
.well-lg: Add a large size well.

Bootstrap 4 Well Example:

<!DOCTYPE html>
<html lang="en">
<head>
  <title>Bootstrap 4 Wells 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/3.3.7/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/3.3.7/js/bootstrap.min.js"></script>
</head>
<body> 
 
<div class="container">
  <h2>Bootstrap 4 Wells Example</h2>
  <div class="well well-sm">WorkList</div>
  <div class="well">Alerts</div>
  <div class="well well-lg">Updates</div>
</div>
 
</body>
</html>

Output: