.theme-main-menu .logo img,
.sidebar-nav .logo img {
    max-height: 48px !important;
    width: auto !important;
    height: auto !important;
}

@media (max-width: 991px) {
    .theme-main-menu .logo img,
    .sidebar-nav .logo img {
        max-height: 42px !important;
    }
}