.pkp_site_name_wrapper {
    position: relative;
}
.pkp_site_name_wrapper::after {
    content: "e-ISSN 2776-1878   p-ISSN 2086-7816";
    position: absolute;
    top: 10px;
    right: 20px;
    font-size: 18px;
    font-weight: 600;
    color: #333;
}

@media (max-width: 768px) {
    .pkp_site_name_wrapper::after {
        display: none;
    }
}