.lang-pen {
    position: absolute;
    right: 0;
    bottom: 10px;
    z-index: 999;
    margin: 0 !important;
}

@media(max-width: 767px){
    .lang-pen {
        position: absolute;
        right: calc(50% - 20px);
        bottom: 10px;
        z-index: 999;
        margin: 0 !important;
    }
}