I was creating my admin panel (admin homepage) and then took out the following code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ZanimeCMS: Admin Center</title>
<link rel="stylesheet" type="text/css" href="../css/home.css" />
<script type="text/javascript" src="../js/jquery-1.8.2.min.js"></script>
</head>

<body>
<!--START Admin Wrapper-->
<div id="adminwrapper">
    <!--START Header-->
    <div id="header">
        <!--START Col-Full-->
        <div class="col-full">
            <!--START Header LEFT-->
            <div class="header-left">
                <h2>ZanimeCMS Admin Center</h2>
                <!--START Admin Menu-->
                <ul id="admin-menu">
                    <li><a href="#">Dashboard</a></li>
                    <li><a href="#">Pages</a></li>
                    <li><a href="#">Posts</a></li>
                    <li><a href="#">General Settings</a></li>
                    <li><a href="#">Manage Users</a></li>
                </ul>
                <!--END Admin Menu-->
            </div>
            <!--END Header RIGHT-->
            <!--<div class="clear"> Do Not Remove and Leave BLANK!</div>-->
            <!--START Header RIGHT-->
            <div class="header-right">
                <!--START User-->
                <div id="user">
                    <span class="user-name">User</span>
                    <span class="settings">Settings</span>
                </div>
                <!--END User-->
            </div>
            <!--END Header RIGHT-->
        </div>
        <!--END Col-Full-->
    </div>
    <!--END Header-->

I then stuck it in a file called header.php and placed it in my include folder. I then added the following PHP:

<?php include_once ('include/header.php'); ?>

To admin/index.php as well as the rest of the HTML on admin/index.php:

<!--START Sub Header-->
    <div id="sub-header">
        <div class="col-full">
            <ul id="admin-sub-menu">
            <li><a href="#">Dashboard</a></li>
            <li><a href="#">Dashboard</a></li>
            <li><a href="#">Dashboard</a></li>
            </ul>
        </div>
    </div>
    <!--END SubHeader-->
</div>
<!--END Admin Wrapper-->
</body>
</html>

Now everything is working when I view admin/index.php (PHP includes the header.php to index.php) except the CSS. It is not styling anything. However if I view header.php in a browser it styles it like it should. Am I missing a step or does my index.php still needs it's own (which doesn't make sense becasue HEADER tag can't be inside the body) so I must be missing a PHP step:

<header></header>

Tags for the CSS to work as if the page was whole. Or do I need to have a separate CSS file for header.php and index.php as well as footer.php?

What happens when you include a file, is that the contents of the file that is being included are loaded on the place where your include function is executed.

So, for example, when you have code like:

<html>
include 'header.php';

... blablabla ...
</html>

And header.php looks like this:

<head>
... blablabla ...
</head>

the output to your browser will be as follows:

<html>
<head>
... blablabla ...
</head>

... blablabla ...
</html>

You should double check if the link to your CSS file is working :). You don't need separate CSS files.

This is index.php (for admin):

zanime-sample

The part in the header is everything above the three Dashboard links. The dashborad links on located on/in index.php

I know the css file is working becasue I can go and view header.php in the browser and it looks like this:

Image Here

It may already be, but your CSS src needs to be relative to your index - include paths
You can also try an absolute path as a debug test.

Yea, as adam says, you can try if specifying the full path to your css file instead of a relative path works.

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