#poststuff .acf_postbox .inside .label {
    width: 20%;
    margin: 0;
    white-space: nowrap;
}

#poststuff .acf_postbox .inside .label+* {
    width: 80%;
    margin: 0;
}

#poststuff .acf_postbox .inside .field:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: '';
    clear: both;
    height: 0;
}

* html #poststuff .acf_postbox .inside .field,
*:first-child+html #poststuff .acf_postbox .inside .field {
    zoom: 1;
}