.header-logo img {
    max-width: 160px;
    height: auto;
}

.about-logo img {
    max-width: 160px;
    height: auto;
}

.mobile-logo img {
    max-width: 140px;
    height: auto;
}

@media (max-width: 575px) {
    .header-logo img {
        max-width: 140px;
    }
    
    .about-logo img {
        max-width: 140px;
    }
    
    .mobile-logo img {
        max-width: 120px;
    }
}