Links of some borrowed code:

https://stackoverflow.com/questions/12528316/removing-underline-with-href-attribute

https://www.jsdiaries.com/how-to-remove-html-purple-link-an-easy-solution/

https://stackoverflow.com/questions/19270594/make-image-appear-on-link-hover-css

https://www.w3schools.com/howto/howto_css_display_element_hover.asp