Bootstrap Wells
In Bootstrap, well are used to add a rounded border around an element. It is default some padding and gray background color.
It is like a container that displays the content. The class .well is used with <div> element to add well.
Example:
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap 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/3.2.1/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>Well</h2>
<div class="well">Basic Well</div>
</div>
</body>
</html>