external_css2.html

<!DOCTYPE html>
<html>
    <head>
        <title>External CSS #2</title>
        <link rel="stylesheet" href="style.css">
    </head>
    <body>
        
        <h1>External CSS #2</h1>

        <div class="font-red" id="unique">
            Div #1
        </div>
        <div class="font-red" id="">
            Div #2
        </div>
        <div class="font-red bg-blue" id="">
            Div #3
        </div>
        <div class="font-red bg-yellow" id="">
            Div #4
        </div>

    </body>
</html>