@media all and (min-width: 800px) {
    .fancybox-thumbs {
        top: auto;
        width: auto;
        bottom: 0;
        left: 0;
        right: 0;
        height: 95px;
        padding: 10px 10px 5px 10px;
        box-sizing: border-box;
        background: rgba(0, 0, 0, 0.3);
    }
    .fancybox-show-thumbs .fancybox-inner {
        right: 0;
        bottom: 95px;
    }
}

#btn_galeria {
    background-color: rgb(159, 211, 211, 0);
    position: absolute;
    cursor: pointer;
    width: 120px;
    height: 120px;
    z-index: 2;
    top: 1142px;
    left: 231px;
    border-radius: 70px;
}

#galeria {
    position: absolute;
    z-index: 3;
}