#sw11_floating_back_button {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 50;
    right: 1.25rem; 
}
@media (min-width: 481px) {
    #sw11_floating_back_button {
        right: calc((100vw - 480px) / 2 + 1.25rem);
    }
}