Hi @AZanchiA-Iperge
Please follow the instructions from @OliverRodrigues. In addition, you can get the source code of your WIX site, preferably each page HTML source, CSS and JS and copy it into Power Pages appropriate section.
For your CSS
In portal management
1. Under content > Web pages > Choose your appropriate web page
2. Localised Content > Web page > Edit > Advanced > Custom CSS
For JS, Similar approach but choose Custom JS. Screenshot for your reference.
Hope it helps.
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