.btn_fix_reservation { position: fixed; left: 0; bottom: 0; background: #AA8D48; padding: 20px 25px 20px 20px; z-index: 10; }

.menu_price .menu_price_item .prc { flex-grow: 2; }

@media screen and (max-width: 768px) {
    .btn_fix_reservation .ja {
        display: block;
        display: inline-block;
        position: absolute;
        right: 50%;
        top: 50%;
        -webkit-transform: translate(50%,-50%);
        transform: translate(50%,-50%);
        font-size: 1.1rem;
        letter-spacing: 0.15em;
    }
}