.promo-case {
    display: flex;
    justify-content: space-between;
    max-width: 900px;
}
.promo-case__l {
    flex-basis: 50%;
}
.promo-case__r {
    flex-basis: 45%;
}
.promo-case__title {
    margin: 0;
    font-size: 20px;
}
.promo-case__code {
    font-weight: bold;
}
.promo-case__button-wrap {
    text-align: center;
}
.promo-case__button {
    background: #cfb09d;
    padding: 10px;
    display: inline-block;
    font-weight: bold;
    text-transform: uppercase;
    color: #fff;
}
.promo-case__button:hover {
    color: #000;
}

@media screen and (max-width: 480px) {
    .promo-case {
        flex-wrap: wrap;
    }
    .promo-case__l {
        flex-basis: 100%;
    }
    .promo-case__r {
        flex-basis: 100%;
        margin-top: 25px;
    }
}