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.card {
    position:relative;
}
.card__side {
    transition:all .8s ease;
    color:white;
    font-size:2rem;
    position:absolute;
    top:0;
    left:0;
    height:300px;
    width:500px;
    backface-visibility:hidden;
}
.card__side--front {
    /* background-color:#2196F3;
    */
      position:relative;
    background-position:center;
    background-repeat:no-repeat;
    background-size:cover;
}
.card__side--back {
    /* background-color:#303F9F;
    */
      transform:rotateY(180deg);
    background-position:center;
    background-repeat:no-repeat;
    background-size:cover;
}
.showGreen {
    transform:rotateY(-180deg);
}
.showRed {
    transform:rotateY(0);
}
#front-7 {
    background-image:url(http://www.jq22.com/img/cs/500x300-1.png);
}
/* Back */
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