inline

<?php
// Initialize the session
session_start();

// Check if the user is logged in, if not then redirect him to login page
if(!isset($_SESSION["loggedin"]) || $_SESSION["loggedin"] !== true){
    header("location: login.php");
    exit;
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="keywords" content="HTML, CSS, tutorial, free">
<meta name="author" content="codedskills">
<meta name="description" content="Learn HTML step by step">
<meta charset="UTF-8">
<meta charset="UTF-8">

                             <title>Welcome</title>

<style>

body{
     background-color:black;
}
h1{
    color:white;
}
p{
    background-color: blueviolet;
}
body{ font: 14px sans-serif; text-align: center; }
</style>
</head>

<h3 class="my-5"><f style="color:rgb(247, 227, 0)">You are logged in as: <b><?php echo htmlspecialchars($_SESSION["username"]); ?></b></h3>
<p>
<center><h1 style="color:red">UNDER CONSTRUCTION</h1></center>
<a href="reset-password.php" class="btn btn-warning"><f style="color:rgb(247, 227, 0)">____________Reset Your Password____________</a>
<a href="logout.php" class="btn btn-danger ml-3"><f style="color:rgb(247, 227, 0)">____________Sign Out of Your Account____________</a>
</p>
<center><h1><a href="https://codedskills.org/welcome.php" target=_blank><f style="color:lime">_-_-_-_-_-CodedSkills.org-_-_-_-_-_</h1></a></center>
    <center><h1 style="color:silver">.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.</ins></h1></center>
<center><h1><ins style="color:orange">Adding global CSS values.</h1></center>

------------------------
<center><iframe allowtransparency="true" style="background-color: lightblue;" src="https://codedskills.net/learn_css/css_inline.txt" width="700" height="400"></iframe></center>
<center><h1 style="color:silver">.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.</ins></h1></center>


<center><li><h1><a href="https://codedskills.org/learn_css_external.php" ><f style="color:lime">  Next page: ----->>> External style sheet: ----->>></a></li></BODY></center>

<center><li><h1><a href="https://codedskills.org/learn_css.php" ><f style="color:crimson"> <---- Back to CSS page 1</a></li></BODY></center>


<center><iframe allowtransparency="true" style="background-color: lightblue;" src="https://codedskills.net/learn_css/css.txt" width="700" height="155"></iframe></center>

</body>
</html>