Hello all,
Chapter 8 makes a website template and I think the concise.min.css on the Github code is messed up (it's all on one line, no spacing). For those struggling with the layout, here may be the solution. The header.html, index.php, and footer.html were not showing up correctly in my browser (but still functional). The way I solved this was replace:
<link rel="stylesheet" type="text/css" media="screen" href="css/concise.min.css" />
with
<link rel="stylesheet" type="text/css" media="screen" href="https://cdn.concisecss.com/concise.min.css" />