body {
    background-color: #1e6cc7;
    width: 100%;
    height: 100vh;
    margin: 0;
}

.bookshelf_wrapper {
    position: relative;
    top: 60%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.books_list {
    margin: 0 auto;
    width: 300px;
    padding: 0;
}

.book_item {
    position: absolute;
    top: -120px;
    box-sizing: border-box;
    list-style: none;
    width: 40px;
    height: 120px;
    opacity: 0;
    background-color: #1e6cc7;
    border: 5px solid white;
    transform-origin: bottom left;
    transform: translateX(300px);
    -webkit-animation: travel 2500ms linear infinite;
    animation: travel 2500ms linear infinite;
}

    .book_item.first {
        top: -140px;
        height: 140px;
    }

        .book_item.first:before, .book_item.first:after {
            content: "";
            position: absolute;
            top: 10px;
            left: 0;
            width: 100%;
            height: 5px;
            background-color: white;
        }

        .book_item.first:after {
            top: initial;
            bottom: 10px;
        }

    .book_item.second:before, .book_item.second:after, .book_item.fifth:before, .book_item.fifth:after {
        box-sizing: border-box;
        content: "";
        position: absolute;
        top: 10px;
        left: 0;
        width: 100%;
        height: 17.5px;
        border-top: 5px solid white;
        border-bottom: 5px solid white;
    }

    .book_item.second:after, .book_item.fifth:after {
        top: initial;
        bottom: 10px;
    }

    .book_item.third:before, .book_item.third:after {
        box-sizing: border-box;
        content: "";
        position: absolute;
        top: 10px;
        left: 9px;
        width: 12px;
        height: 12px;
        border-radius: 50%;
        border: 5px solid white;
    }

    .book_item.third:after {
        top: initial;
        bottom: 10px;
    }

    .book_item.fourth {
        top: -130px;
        height: 130px;
    }

        .book_item.fourth:before {
            box-sizing: border-box;
            content: "";
            position: absolute;
            top: 46px;
            left: 0;
            width: 100%;
            height: 17.5px;
            border-top: 5px solid white;
            border-bottom: 5px solid white;
        }

    .book_item.fifth {
        top: -100px;
        height: 100px;
    }

    .book_item.sixth {
        top: -140px;
        height: 140px;
    }

        .book_item.sixth:before {
            box-sizing: border-box;
            content: "";
            position: absolute;
            bottom: 31px;
            left: 0px;
            width: 100%;
            height: 5px;
            background-color: white;
        }

        .book_item.sixth:after {
            box-sizing: border-box;
            content: "";
            position: absolute;
            bottom: 10px;
            left: 9px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            border: 5px solid white;
        }

    .book_item:nth-child(2) {
        -webkit-animation-delay: 416.6666666667ms;
        animation-delay: 416.6666666667ms;
    }

    .book_item:nth-child(3) {
        -webkit-animation-delay: 833.3333333333ms;
        animation-delay: 833.3333333333ms;
    }

    .book_item:nth-child(4) {
        -webkit-animation-delay: 1250ms;
        animation-delay: 1250ms;
    }

    .book_item:nth-child(5) {
        -webkit-animation-delay: 1666.6666666667ms;
        animation-delay: 1666.6666666667ms;
    }

    .book_item:nth-child(6) {
        -webkit-animation-delay: 2083.3333333333ms;
        animation-delay: 2083.3333333333ms;
    }

.shelf {
    width: 300px;
    height: 5px;
    margin: 0 auto;
    background-color: white;
    position: relative;
}

    .shelf:before, .shelf:after {
        content: "";
        position: absolute;
        width: 100%;
        height: 100%;
        background: #1e6cc7;
        background-image: radial-gradient(rgba(255, 255, 255, 0.5) 30%, transparent 0);
        background-size: 10px 10px;
        background-position: 0 -2.5px;
        top: 200%;
        left: 5%;
        -webkit-animation: move 250ms linear infinite;
        animation: move 250ms linear infinite;
    }

    .shelf:after {
        top: 400%;
        left: 7.5%;
    }

@-webkit-keyframes move {
    from {
        background-position-x: 0;
    }

    to {
        background-position-x: 10px;
    }
}

@keyframes move {
    from {
        background-position-x: 0;
    }

    to {
        background-position-x: 10px;
    }
}

@-webkit-keyframes travel {
    0% {
        opacity: 0;
        transform: translateX(300px) rotateZ(0deg) scaleY(1);
    }

    6.5% {
        transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
    }

    8.8% {
        transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
    }

    10% {
        opacity: 1;
        transform: translateX(270px) rotateZ(0deg);
    }

    17.6% {
        transform: translateX(247.2px) rotateZ(-30deg);
    }

    45% {
        transform: translateX(165px) rotateZ(-30deg);
    }

    49.5% {
        transform: translateX(151.5px) rotateZ(-45deg);
    }

    61.5% {
        transform: translateX(115.5px) rotateZ(-45deg);
    }

    67% {
        transform: translateX(99px) rotateZ(-60deg);
    }

    76% {
        transform: translateX(72px) rotateZ(-60deg);
    }

    83.5% {
        opacity: 1;
        transform: translateX(49.5px) rotateZ(-90deg);
    }

    90% {
        opacity: 0;
    }

    100% {
        opacity: 0;
        transform: translateX(0px) rotateZ(-90deg);
    }
}

@keyframes travel {
    0% {
        opacity: 0;
        transform: translateX(300px) rotateZ(0deg) scaleY(1);
    }

    6.5% {
        transform: translateX(279.5px) rotateZ(0deg) scaleY(1.1);
    }

    8.8% {
        transform: translateX(273.6px) rotateZ(0deg) scaleY(1);
    }

    10% {
        opacity: 1;
        transform: translateX(270px) rotateZ(0deg);
    }

    17.6% {
        transform: translateX(247.2px) rotateZ(-30deg);
    }

    45% {
        transform: translateX(165px) rotateZ(-30deg);
    }

    49.5% {
        transform: translateX(151.5px) rotateZ(-45deg);
    }

    61.5% {
        transform: translateX(115.5px) rotateZ(-45deg);
    }

    67% {
        transform: translateX(99px) rotateZ(-60deg);
    }

    76% {
        transform: translateX(72px) rotateZ(-60deg);
    }

    83.5% {
        opacity: 1;
        transform: translateX(49.5px) rotateZ(-90deg);
    }

    90% {
        opacity: 0;
    }

    100% {
        opacity: 0;
        transform: translateX(0px) rotateZ(-90deg);
    }
}