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Different pages to have different css file

So i am building my portfolio now, but i also have (concept) design made in the past which i want to develop now to showcase some work. I cant afford to buy hosting for another project, nor to upgrade account subscription to have more projects, so i am wondering if there is a way i can create kinda different websites inside my project, but every page to have its own styling, so if i have for example classes like “section” or “here-heading”, they wont interfere with each other, nor change the look on other pages. I hope you understood what im saying :sweat_smile:

Thank you!