index.php membuat form login remember me

<?php
	$conn = new mysqli("localhost", "root", "", "phptut");

	if(!$conn){
		die("Fatal Error: Connection Faileds");
	}
?>
The Main Interface
This is the where the database connection, just simple copy/paste the provided code below then save it as 'index.php'.

<!DOCTYPE html>

<html lang = "en">
	<head>
		<meta charset = "UTF-8" name = "viewport" content = "width=device-width"/>
		<link rel = "stylesheet" type = "text/css"  href = "css/bootstrap.css"/>
	</head>
<body>
	<nav class = "navbar navbar-default">
		<div class = "container-fluid">
			<a class = "navbar-brand" href = "<a href="https://sourcecodester.com">Sourcecodester</a>
" rel="nofollow">https://sourcecodester.com">Sourcecodester</a>
</a>		</div>
	</nav>
	<div class = "col-md-3"></div>
	<div class = "col-md-6 well">
		<h3 class = "text-primary">PHP - Simple Login With Remember me Script</h3>
		<hr style = "border-top:1px dotted #000;"/>
		<div class = "col-md-1"></div>
		<div class = "col-md-10" style = "box-shadow:0px 0px 1px 0.5px #000; border-radius:1px;">
			<h4>Login Here...</h4><br />
			<form>
				<div class = "form-group">
					<label>Username:</label>
					<input type = "text" id = "username" name = "username" value = "<?php if(ISSET($_COOKIE['username'])){echo $_COOKIE['username'];}?>" class = "form-control"/>
				</div>
				<div class = "form-group">
					<label>Password:</label>
					<input type = "password" id = "password"  name = "password" value = "<?php if(ISSET($_COOKIE['password'])){echo $_COOKIE['password'];}?>" class = "form-control"/>
				</div>
				<div class = "form-group">
				<input type = "checkbox" id = "remember" name = "remember" <?php if(ISSET($_COOKIE['username'])){echo 'checked';}?> /><label>Remember me</label>
				</div>
				<br />
				<br />
				<div class = "form-group">
					<button type = "button" id = "login" class = "btn btn-primary form-control" name = "login" >LOGIN</button>
				</div>
				<br />
			</form>
		</div>
	</div>
</body>
<script src = "js/jquery-3.2.1.js"></script>
<script src = "js/script.js"></script>
</html>