You missed the point.
Would you copy paste around:
<form class="asd fasdf e4rwe sfdg sdfgbbv cxvbxcs asdf asdf wer wer gfdghdfgh fgh">
20x around your static website and keep it updated manually when someone "from design" wants to change the "form" look?
Or would you just <form class="classic-form"> and describe the style of that class of form in a single place?
I know what I'd do. :)
You have a card? Boom, you need to couple styles for the title, for the content, for the footer etc.
You have a form? Boom, you need to couple styles with the form.
The idea that styles are somehow decoupled from content is funny idea that very rarely works out in practice.