.gallery-image{
    max-width: 100%;
    max-height: 100%;
}

a.galeria-a { display: block; width: 100%; height: 230px; margin-bottom: 30px; background-size: cover; background-position: center center; }

a.galeria-a:after {
    content: "";
    display: block;
    width: 100%;
    height: 100%;
    background: #ffba0e;
    opacity: 0;
}
a.galeria-a:hover:after { opacity: .5; }