@media (max-width: 640px){
    #principal-message,
    #affiliation,
    #leadership,
    #achievements{
        padding: 40px 0;
    }
    .text-center .about-title-h2{
        font-size: 2rem;
    }
    .text-center .sub-about-heading{
        font-size: 1.5rem;
    }
}
#affiliation{
    padding: 80px 0;
}