#bta_stamp {
    position: absolute;
    top: -64px;
    left: 45%;
}

#bta_stamp > a > img {
    position: absolute;
    top:16px;
    left:0;
    width: 128px;
    height: 128px
}

@media screen and (max-width: 950px) {
    #bta_stamp {
        position: absolute;
        top: -30px;
        left: 55%;
    }

    #bta_stamp > a > img {
        position: absolute;
        top:16px;
        left:0;
        width: 64px;
        height: 64px
    }
}

@media screen and (max-width: 360px) {
    #bta_stamp {
        display: none;
    }
}