Recursive background

To identify bugs, dom messy and things like that

HTML

<!DOCTYPE html>
<html>
    <head>
        <title>Teste</title>
    </head>
    <body>
        <div>
            Bla
            <div> Blargh </div>
            <div> Bla <a href="#">blargue</a></div>
        </div>
    </body>
</html>

CSS

body * {background-color:rgba(10,0,0,0.1);}