.card_container {
    background-color: transparent;
    width: 100px;
    height: 100px;
    padding: 2px;
    perspective: 1000px;
    float: left;
    cursor: grab;
}
.card {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}
.flip{
    transform: rotateY(180deg);
}
.card_front,.card_back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    background-size:contain;
    backface-visibility: hidden;
}
.card_front {
}
.card_back {
    transform: rotateY(180deg);
}