.bookshelf .thumb {
    display: inline-block;
    cursor: pointer;
    margin: 0px 0.5%;
    width: 15% !important;
    box-shadow: 0px 1px 3px rgba(0,0,0,.3);
    max-width: 100px;
}

    .bookshelf .thumb img {
        width: 100%;
        display: block;
        vertical-align: top;
    }

.bookshelf .shelf-img {
    z-index: 0;
    height: auto;
    max-width: 100%;
    vertical-align: top;
    margin-top: -12px;
}

.bookshelf .covers {
    width: 100%;
    height: auto;
    z-index: 99;
    position: relative;
    text-align: center;
}

.bookshelf {
    text-align: center;
    padding: 0px;
}

.hvrbox * {
    box-sizing: border-box;
}

.hvrbox {
    position: relative;
    display: inline-block;
    overflow: hidden;
    max-width: 100%;
    height: auto;
}

    .hvrbox img {
        max-width: 100%;
    }

    .hvrbox .hvrbox-layer_bottom {
        display: block;
    }

    .hvrbox .hvrbox-layer_top {
        opacity: 0;
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.6);
        color: #fff;
        padding: 15px;
        -moz-transition: all 0.4s ease-in-out 0s;
        -webkit-transition: all 0.4s ease-in-out 0s;
        -ms-transition: all 0.4s ease-in-out 0s;
        transition: all 0.4s ease-in-out 0s;
    }

    .hvrbox:hover .hvrbox-layer_top,
    .hvrbox.active .hvrbox-layer_top {
        opacity: 1;
    }

    .hvrbox .hvrbox-text {
        text-align: center;
        font-size: 18px;
        display: inline-block;
        position: absolute;
        top: 50%;
        left: 50%;
        -moz-transform: translate(-50%, -50%);
        -webkit-transform: translate(-50%, -50%);
        -ms-transform: translate(-50%, -50%);
        transform: translate(-50%, -50%);
    }

    .hvrbox .hvrbox-text_mobile {
        font-size: 15px;
        border-top: 1px solid rgb(179, 179, 179); /* for old browsers */
        border-top: 1px solid rgba(179, 179, 179, 0.7);
        margin-top: 5px;
        padding-top: 2px;
        display: none;
    }

    .hvrbox.active .hvrbox-text_mobile {
        display: block;
    }
.hover_img a {
    position: relative;
}

    .hover_img a span {
        position: absolute;
        display: none;
        z-index: 99;
    }

    .hover_img a:hover span {
        display: block;
    }