#talk_body img {
    max-width: 100%;
}

@media screen and (min-width: 740px) {
    p.btn {
        text-align: center;
    }
    p.btn a img {
        width: 60%;
    }
}

@media screen and (max-width: 640px) {
    p.btn {
        text-align: center;
    }
    p.btn a img {
        width: 98%;
    }
    #talk_body .txt_box {
        padding: 0px 15px 35px 15px;
    }
    #talk_body img {
        width: 100%;
    }
}

@media (min-width: 641px) {
    #talk_body .txt_box {
        padding: 10px 40px 40px 40px;
    }
}