#sec_gal_01 {
    padding: 20px;
    background-color: #000;
    color: #fff;
}
#sec_gal_01 .flip-card_01 {
    background-color: transparent;
    width: 716px;
    height: 991px;
    perspective: 1000px;
    margin: 20px auto;
}
#sec_gal_01 .flip-card_02 {
    background-color: transparent;
    width: 640px;
    height: 1096px;
    perspective: 1000px;
    margin: 20px auto;

}

#sec_gal_01 .flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2);
}

#sec_gal_01 .flip-card_01:hover .flip-card-inner, #sec_gal_01 .flip-card_02:hover .flip-card-inner {
    transform: rotateY(180deg);
}

#sec_gal_01 .flip-card-front, .flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

#sec_gal_01 .flip-card-front {
    background-color: #c0c0c0;
    color: black;
}

#sec_gal_01 .flip-card-back {
    background-color: #c0c0c0;
    color: #000;
    transform: rotateY(180deg);
}