Bedford: Hide Mobile Back to Top button?

Site URL: http://jupiter.coffee

There’s a back to top button that shows up in my footer on a phone (using an iPhone 11 and 11 Pro to test), but it doesn’t show up in the editor if I’m previewing the mobile version. I’d like to remove this button. 

Add to Home > Design > Custom CSS

@media screen and (max-width:640px) {
.nav-wrapper.back-to-top-nav {
    display: none;
}
}