.client-logo img {
    max-width: 100%; /* Make images responsive */
    height: auto; /* Maintain aspect ratio */
}

    .client-logo img.large {
        height: 150px;
    }

    .client-logo img.small {
        height: 40px;
    }

    .client-logo img.companylogo {
        height: 50px;
    }