.img-big {
    width: 100%;
    height: 600px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.img-middle {
    width: 100%;
    height: 400px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.img-small {
    width: 100%;
    height: 300px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}


.gallery-sub-heading-content {

    display: none;
}

.gallery-sub-heading-active {

    display: block!important;
}