Hiding an element added via code injection on mobile view

Site URL: https://polygon-rabbit-4zag.squarespace.com/

Successfully used this guide to add a floating "back to top" button to the website.

Is there a way to hide the added button for mobile view?

Thank you in advance!

Hi. Add to Design > Custom CSS

/* Hide mobile back to top */
@media screen and (max-width:767px) {
a#back-to-top {
    display: none;
}
}