.et_pb_image_overlay {

    position: relative;

}

.et_pb_image_overlay img.overlay {

    display: block;

    position:absolute;

    top: 0;

    left: 0;

    opacity: 0;

    z-index: 1;

    transition: opacity 0.4s ease 0s;

}

.aw-show-overlay {

    opacity:1 !important;

}