Back to Top link states unfortunately need to be styled via Custom CSS.
It would be way cooler to have a simple shortcode like #laynextproject
or #layprevproject
instead of the interface element in the editor. This way the text element is a hyperlink and therefore behaves like a textlink does.
Until now one always has to add some Custom CSS to make the Back to Top have a hover state. E.g:
.scrolltotop p:hover {
color: #efcece !important;
}
Cheers!!