Im sorry but I think you completely misunderstand the difference between CSS and design. You don't need to know anything about CSS to design a website, but in order to translate a design into a working website you need to know how to utilise CSS to develop that design into a functional website.
I work with several Website Designers and they couldn't write a line of CSS, but create incredible Website Designs, and I can translate those designs into fully responsive websites.
A web designer shouldn't list CSS as a skill, unless they are also a developer, CSS as a skill is about writing the syntax.
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