how to revert an image in css code example

Example 1: flip an image js

<div class="f1_container">
    <div class="shadow f1_card">
        <div class="front face">
            <img src="http://media-cdn.tripadvisor.com/media/photo-s/03/48/0b/14/dolphin-view-chalets.jpg" style="height: 281px; width: 450px;" />
        </div>
        <div class="back face center">
            <img src="http://media-cdn.tripadvisor.com/media/photo-s/03/48/0b/14/dolphin-view-chalets.jpg" style="height: 281px; width: 450px;" />
        </div>
    </div>
</div>

Example 2: flip an image js

.f1_container {
    position: relative;
    margin:10px;
    width: 450px;
    height: 281px;
    z-index : 1;
    float:left;
}
.f1_container {
    -webkit-perspective: 1000;
    perspective: 1000;
}
.f1_card {
    width: 100%;
    height: 100%;
    -webkit-transform-style: preserve-3d;
    -webkit-transition: all 1.0s linear;
    transform-style: preserve-3d;
    transition: all 1.0s linear;
}
.f1_container.active .f1_card {
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
    box-shadow: -5px 5px 5px #aaa;
}
.face {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
}
.face.back {
    display: block;
    -webkit-transform: rotateY(180deg);
    transform: rotateY(180deg);
    box-sizing: border-box;
    color: white;
    text-align: center;
    background-color: #aaa;
}