<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/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Stacked Form with Validation</h2>
<form action="/action_page.php" class="was-validated"> <!-- was-validated class to provide validation before submitting form-->
<div class="form-group"> <!-- .form-group to ensure proper margins-->
<label for="uname">Email-Address:</label>
<input type="email" class="form-control" id="uname" placeholder="Enter Email" name="email" required>
<div class="valid-feedback">Email is Valid.</div> <!-- To add valid feedback message -->
<div class="invalid-feedback">Error !! This field cannot be empty</div> <!-- To add in-valid feedback message -->
</div>
<div class="form-group">
<label for="pwd">Password:</label>
<input type="password" class="form-control" id="pwd" placeholder="Enter password" name="pswd" required>
<div class="valid-feedback">Password is Valid.</div>
<div class="invalid-feedback">Error !! This field cannot be empty</div>
</div>
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input" type="checkbox" name="remember" required> I agree with terms and conditions.
<div class="invalid-feedback">Error !! Please check this checkbox to continue.</div>
</label>
</div>
<button type="submit" class="btn btn-primary">Submit</button>
</form>
</div>
</body>
</html>
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External JavaScript
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