.content {
    position: relative;
    width: 960px;
    margin: auto;
}

.books {
    position: relative;
    margin-left: 10px;
    padding-left: 104px;
    padding-bottom: 20px;
}
.book {
    position: relative;
    top: 0;
    left: 0;
    margin-left: -104px;
    margin-top: 30px;
    display: inline-block;
    background: #fff;
    background: transparent;
    transition: 0.8s ease;
    transform: perspective(100px) rotateY(5deg);
    box-shadow: -5px 0 10px #000;
    cursor: pointer;
}
.book:not(:last-child).active {
    transform: perspective(100px) rotateY(2deg) scale(1.1);
    left: -100px;
}
.book:last-child.active {
    transform: perspective(100px) rotateY(2deg) scale(1.1);
    left: -10px;
}
.cover {
    width: 160px;
    height: 240px;
    border: 2px solid #BFC8EA;
    border-radius: 2px;
    background: #fff;
}

.overlays {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin-left: -5px;
}
.overlay {
    float: left;
    height: 100%;
    width: 62.5px;
    cursor: pointer;
    border: 1px solid transparent;
    /*border: 1px solid #0f0;*/
}
.overlay:last-child {
    width: 170px;
}