.flip-card {
    background-color: transparent;
/*    width: 100%;
    height:30vh;*/
    perspective: 1000px;
}
.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);
}
.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}
.flip-card-front, .flip-card-back {
    /*position: absolute;*/
/*    width: 100%;
    height: 100%;
*/    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
}
.flip-card-front {
    /*background-color: #bbb;*/
    color: black;
}
.flip-card-back {
    /*background-color: #2980b9;*/
    background-color: #728f98;
    color: white;
    transform: rotateY(180deg);
}