Over 171 free icons Scroll Back to Top Button and unlimited colors – custom button.
Just install the plugin and arrow back to top will be show. Scroll Back to Top Button WordPress plugin add a button that appears only when users scroll down the page allowing them to scroll to the top of the page.
To learn more about the Back to Top Button plugin please see plugin URI. See screenshot examples at https://seosthemes.com/wp-back-to-top-button/