[class^="iconimg-"], [class*=" iconimg-"]::before {
    width: 16px;
    height: 16px;
}

.iconimg-document-u:before {
    content: url('../img/img-document-u.png');
    width: 16px;
    height: 16px;
}

.iconimg-document-p:before {
    content: url('../img/img-document-p.png');
}

/*.iconimg-document-n:before {
    content: url('../img/img-document-n.png');
}
*/
.iconimg-document-p {
    position: relative;
}

    .iconimg-document-p::before {
        content: '';
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        height: 100%;
        background: url('../img/img-document-n.png');
        margin-right: 3px;
    }