.footer .bg{position:relative;background:url(../img/sp-footer-bg.jpg) top center / cover no-repeat}
.footer .bg::before{content:'';display:block;width:100%;padding-top:34.5rem}
.copyright{font-size:.75rem;padding:.313rem 0;text-align:center}
@media (min-width:64rem){
.footer .bg{position:relative;background:url(../img/footer-bg.jpg) top center / cover no-repeat}
.footer .bg::before{padding-top:32.563rem}  
}