TMSWEB_ResponsiveGrid example. CSS

I am playing around with he sample and cannot see where the app picks up the CSS from?



}

.bg-webgreen {
    background-color: #00838F;
    font-family: 'Montserrat', sans-serif;
    color: #FFFFFF;


https://download.tmssoftware.com/tmsweb/demos/css/tmswebcoredemo.css

In the project HTML file, there is:

<link href="https://download.tmssoftware.com/tmsweb/demos/css/tmswebcoredemo.css" rel="stylesheet"/>

The Unit1.html file contains

<html>
  <head>
    <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
    <title>TMS Web Project</title>
  </head>
  <body>
    <header>
        <img src="https://www.tmssoftware.com/site/img/logos/loper.svg" class="background-image">
        <div class="top-title top-title-small">
            <a href="https://www.tmssoftware.com/" target="_blank" title="Visit tmssoftware">
                <img class="large" src="https://www.tmssoftware.com/site/img/logo_tms_software.png">
                <img class="small" src="https://www.tmssoftware.com/site/img/logo_tms_software_small.png">
            </a>
        </div>
        <div class="top-title top-title-small">
            <a href="http://web.tmssoftware.com/" target="_blank" title="Visit TMS Web Core page">
                <div class="tms-panel-thumb">WEB</div>
                <div class="tms-thumb-text">TMS WEB Core</div>
            </a>
        </div>
        <div class="bg-webgreen top-title top-title-detail" id="title">Title</div>
        <div class="bg-webgreen top-title top-title-description">
            <table>
            <tr><td class="icon">
            <i class="icon material-icons">info</i>
            </td><td>
            <span id="description">Description</span>
            </td></tr>
            </table>
        </div>
    </header>
    <div id="appcontent" class="appcontent">
    </div>
  </body>
</html>

Nothing in the index.html file.

What am I missing please ?

The index.html file as we deliver it in the install distribution has the link to the CSS file.