.btn:hover, .btn:focus, .btn:active {
    outline: 0 !important;
}

/* entire container, keeps perspective */
.card-container {
    -webkit-perspective: 800px;
    -moz-perspective: 800px;
    -o-perspective: 800px;
    perspective: 800px;
}

/* flip the pane when hovered */
.card-container:not(.manual-flip):hover .card, .card-container.hover.manual-flip .card {
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    transform: rotateY(180deg);
}

/* flip speed goes here */
.card {
    -webkit-transition: -webkit-transform .5s;
    -moz-transition: -moz-transform .5s;
    -o-transition: -o-transform .5s;
    transition: transform .5s;
    -webkit-transform-style: preserve-3d;
    -moz-transform-style: preserve-3d;
    -o-transform-style: preserve-3d;
    transform-style: preserve-3d;
    position: relative;
}

/* hide back of pane during swap */
.front, .back {
    -webkit-backface-visibility: hidden;
    -moz-backface-visibility: hidden;
    -o-backface-visibility: hidden;
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    background-color: #ffffff;
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.14);
}

/* front pane, placed above back */
.front {
    z-index: 2;
}

/* back, initially hidden pane */
.back {
    -webkit-transform: rotateY(180deg);
    -moz-transform: rotateY(180deg);
    -o-transform: rotateY(180deg);
    transform: rotateY(180deg);
    z-index: 3;
}

/* Style */
.card {
    background: none repeat scroll 0 0 #ffffff;
    border-radius: 4px;
}
.card-container, .front, .back {
    width: 100%;
    height: 250px;
    border-radius: 4px;
}
.card .content {
    background-color: rgba(0, 0, 0, 0);
    box-shadow: none;
    padding: 10px 20px 20px;
}
.card .content .main {
    min-height: 140px;
}
.card .footer {
    border-top: 1px solid #eeeeee;
    color: #999999;
    margin: 25px 0 0;
    padding: 10px 0;
    text-align: center;
}

/* Fix bug for IE */
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
    .front, .back {
        -ms-backface-visibility: visible;
        backface-visibility: visible;
    }
    .back {
        visibility: hidden;
        -ms-transition: all 0.2s cubic-bezier(.92, .01, .83, .67);
    }
    .front {
        z-index: 4;
    }
    .card-container:not(.manual-flip):hover .back, .card-container.manual-flip.hover .back {
        z-index: 5;
        visibility: visible;
    }
}