.sky_mark_footer {
    width: 80%;
    filter: brightness(2.5);
}

@media screen and (max-width: 425px) {
     a.footer_logo 
     {
        display: flex;
        justify-content: center;
     }
}

@media screen and (max-width: 768px) {
    .sky_mark_footer {
        width: 50%;
        filter: brightness(2.5);
    }
}