Hi @Derya,
1. It might be the cache, could you please clearing all the caches then test again? The text color is black already.
2. Please add this custom CSS code under XStore > Theme Options > Theme Custom CSS > Global CSS:
@media only screen and (max-width: 480px) {
.back-top {
right: 45px;
bottom: 120px;
}
}
Hope it helps!















