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Bottom Border Nav Links:
https://www.w3schools.com/howto/howto_css_navbar_border.asp -
Creating a responsive navigation bar:
https://codenart.github.io/sample/2017/09/03/sample-2-responsive-navbar.html -
Creating link to specific points in a page:
https://designshack.net/articles/html/how-to-link-to-specific-points-in-a-page-and-animate-the-scroll/ -
Creating dark mode in simple html, css & js:
https://www.developerdrive.com/css-dark-mode/ -
To make jquery work:
https://stackoverflow.com/questions/19830689/why-is-the-jquery-script-not-working/19831279#19831279