There aren't any laravel sites that don't use a "HTML-CSS template". In Laravel, they're separated into "Views" (your HTML, read the docs), and assets (your css), found in the public folder. You're good.
Perfectly fine in my opinion. I've used templates downloaded from the web and custom templates and have not had a problem.
If you find yourself reusing a specific view in multiple views, you may want look at View Composers:
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