.site-logo {
    max-width: 200px;   /* دسکتاپ */
    height: auto;
}

@media (max-width: 992px) {
    .site-logo {
        max-width: 120px;
    }
}

@media (max-width: 768px) {
    .site-logo {
        max-width: 100px;
    }
}

@media (max-width: 576px) {
    .site-logo {
        max-width: 90px;
    }
}
/*************************************************/