This project is based on css before and after effects on a button element.Before and after in css are known as pseudo-elements because they are selected with '::' sign.Before and after are used very commonly in designing.
1 ::pseudo_elements: https://www.w3schools.com/css/css_pseudo_elements.asp 2 ::before: https://www.w3schools.com/cssref/sel_before.asp 3 ::after: https://www.w3schools.com/cssref/sel_after.asp