Urgh … some Elementor kit CSS is ie. this:
body.elementor-kit-14 a {
color: #00C2FF;
font-family: "Fira Sans", fira sans;
}
body.elementor-kit-14 a:hover {
color: #151B3F;
}
If you can’t change that then use this CSS to override it:
.generate-back-to-top, .generate-back-to-top:visited {
background-color: #000000 !important;
color: #FFFFFF !important;
}
.generate-back-to-top:hover, .generate-back-to-top:focus {
background-color: #ffffff !important;
color: #000000 !important;
}