.c-link_top {
    position: fixed;
    bottom: 100px;
    right: 15px;
    z-index: 99;
}




.br-sp { display:none; }
.br-pc { display:block; }

@media only screen and (max-width: 640px){
.br-sp { display:block; }
.br-pc { display:none; }
}