.card {
    width: 200px;
    height: 300px;
    perspective: 1000px;
}

.card-inner {
    width: 100%;
    height: 100%;
    position: absolute;
    backface-visibility: hidden;
    transform-style: preserve-3d;
    transition: transform 0.5s;
}


.card-front {
    background-color: #3498db;
    transform: rotateY(0deg);
}

.card-back {
    background-color: #e74c3c;
    transform: rotateY(180deg);
}
.thumbnail{
    padding: 0;
}