.prices {
    display: flex;
}

.prices .prices__wrapper {
    width: 100%;
}

@media screen and (min-width: 640px) {
    .prices {
        flex-wrap: wrap;
    }

    .prices .button.calculation {
        margin-left: auto;
    }
}

@media screen and (max-width: 639px) {
    .prices {
        flex-direction: column;
    }

    .prices .button.calculation {
        align-self: center;
        margin-bottom: 25px;
    }

    .prices .prices__title {
        align-self: flex-start;
    }
}