is it ethical to use third party libraries and other stuff in my portfolio website?

I am confused as to whether it is acceptable to use code produced by other people for something that is related to me and my creations. Do i have to resort to coding my portfolio website with pure css and js to demonstrate my credibility and experience as a candidate employee? Does the ideology of 'using other people's tools to create a better product' apply here in this context, or would it be considered plagiarism? Is there some sort of gradient as to how much i should use third party tools for my website for it be ethically appropriate, if it all?