Carrd is popular with Gen Z and IIRC does let you do full CSS customization (and some limited HTML). I haven't used it myself so I can't give you a full rundown

Carrd is popular with Gen Z and IIRC does let you do full CSS customization (and some limited HTML). I haven't used it myself so I can't give you a full rundown, but some of the fancier Carrds I've seen have been really cool