.book .book-body {
    .navigation {



        display: flex;
        justify-content: space-between;
        .navigation-item{
            font-size: 40px;
            color: @navigation-color;

            &:hover {
                text-decoration: none;
                color: @navigation-hover-color;
            }
            .transition(all 350ms ease);
        }
    }
}