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If you have only made edits to vmsite-ltr.css rather than make css overrides (different from template overrides) then the easiest way to keep those style changes is
Read more: CSS overrides
Read more: Templating product page and category page ($this-> VS $product->)
Be sure to use the edited files as template overrides so that they are preserved during Virtuemart 2 updates.
Unless you are already using overrides the templates are...
Read more: Template Overrides
Make Virtuemart shop use different template from rest of site.
Read more: Another template for Virtuemart