#imgPhoto, #imgWorcester {
    opacity:0.2;
    transition: opacity 1s;
}

#overlayContainer {
    position:absolute;
}

@media (min-width: 768px) {
    #imgPhoto, #imgWorcester {
        opacity:1 !important;
    }
    
    #overlayContainer {
        position: relative;
    }
}