@media (max-width: 640px) {
    #talk_wrap h2 {
        margin: 0 0 calc(20 / 640 * 100vw) 0;
        font-size: calc(38 / 640 * 100vw);
        letter-spacing: .05em;
        line-height: 1.4em;
        text-align: center;
    }
}

@media (max-width: 640px) {
    #talk_body .txt_box {
        max-width: 480px;
        padding: 35px 15px 35px 15px;
        margin: calc(20 / 640 * 100vw) auto calc(60 / 640 * 100vw) auto;
        box-sizing: border-box;
        border-radius: 10px;
    }
}

@media (min-width: 641px) {
    #talk_body .txt_box {
        max-width: 550px;
        padding: 50px 20px 50px 20px;
        margin: 20px auto 20px auto;
        box-sizing: border-box;
        border-radius: 10px;
    }
}

@media (max-width: 640px) {
    #talk_body .txt_box .desc p {
        margin: 0 0 10px 0;
        line-height: 1.8em;
        font-size: .85rem;
    }
}